0.4.4

bilibili热搜组件

LanMountainDesktop/ComponentSystem/BuiltInComponentIds.cs

@@ -29,6 +29,10 @@ public static class BuiltInComponentIds
     public const string HolidayCalendar = "HolidayCalendar";
     public const string DesktopDailyPoetry = "DesktopDailyPoetry";
     public const string DesktopDailyArtwork = "DesktopDailyArtwork";
+    public const string DesktopDailyWord = "DesktopDailyWord";
+    public const string DesktopCnrDailyNews = "DesktopCnrDailyNews";
+    public const string DesktopBilibiliHotSearch = "DesktopBilibiliHotSearch";
+    public const string DesktopExchangeRateCalculator = "DesktopExchangeRateCalculator";
     public const string DesktopWhiteboard = "DesktopWhiteboard";
     public const string DesktopBlackboardLandscape = "DesktopBlackboardLandscape";
     public const string DesktopBrowser = "DesktopBrowser";

LanMountainDesktop/ComponentSystem/ComponentRegistry.cs

@@ -225,6 +225,42 @@ public sealed class ComponentRegistry
                 MinHeightCells: 2,
                 AllowStatusBarPlacement: false,
                 AllowDesktopPlacement: true),
+            new DesktopComponentDefinition(
+                BuiltInComponentIds.DesktopDailyWord,
+                "Daily Word",
+                "Book",
+                "Info",
+                MinWidthCells: 4,
+                MinHeightCells: 2,
+                AllowStatusBarPlacement: false,
+                AllowDesktopPlacement: true),
+            new DesktopComponentDefinition(
+                BuiltInComponentIds.DesktopCnrDailyNews,
+                "CNR Daily News",
+                "News",
+                "Info",
+                MinWidthCells: 4,
+                MinHeightCells: 2,
+                AllowStatusBarPlacement: false,
+                AllowDesktopPlacement: true),
+            new DesktopComponentDefinition(
+                BuiltInComponentIds.DesktopBilibiliHotSearch,
+                "Bilibili Hot Search",
+                "News",
+                "Info",
+                MinWidthCells: 4,
+                MinHeightCells: 2,
+                AllowStatusBarPlacement: false,
+                AllowDesktopPlacement: true),
+            new DesktopComponentDefinition(
+                BuiltInComponentIds.DesktopExchangeRateCalculator,
+                "Exchange Rate Converter",
+                "Calculator",
+                "Calculator",
+                MinWidthCells: 4,
+                MinHeightCells: 4,
+                AllowStatusBarPlacement: false,
+                AllowDesktopPlacement: true),
             new DesktopComponentDefinition(
                 BuiltInComponentIds.DesktopWhiteboard,
                 "Blackboard Portrait",

LanMountainDesktop/Localization/en-US.json

@@ -12,6 +12,7 @@
     "settings.nav.status_bar":  "Status Bar",
     "settings.nav.weather":  "Weather",
     "settings.nav.region":  "Region",
+    "settings.nav.update":  "Update",
     "settings.nav.about":  "About",
     "settings.wallpaper.title":  "Wallpaper",
     "settings.wallpaper.description":  "Pick an image or video to apply as the app window wallpaper immediately.",
@@ -195,6 +196,38 @@
     "settings.region.timezone_header":  "Time Zone",
     "settings.region.timezone_desc":  "Select a time zone. Clock and calendar widgets will follow this zone.",
     "settings.region.applied_format":  "Language switched to: {0}",
+    "settings.update.title":  "Update",
+    "settings.update.current_version_label":  "Current Version",
+    "settings.update.latest_version_label":  "Latest Release",
+    "settings.update.published_at_label":  "Published At",
+    "settings.update.options_header":  "Update Options",
+    "settings.update.options_desc":  "Configure update checks and release channel.",
+    "settings.update.auto_check_toggle":  "Automatically check for updates on startup",
+    "settings.update.include_prerelease_toggle":  "Include prerelease versions",
+    "settings.update.channel_label":  "Update Channel",
+    "settings.update.channel_stable":  "Stable",
+    "settings.update.channel_preview":  "Preview",
+    "settings.update.actions_header":  "Update Actions",
+    "settings.update.actions_desc":  "Check releases, download installer, and start update.",
+    "settings.update.check_button":  "Check for Updates",
+    "settings.update.download_install_button":  "Download & Install",
+    "settings.update.download_progress_idle":  "Download progress: -",
+    "settings.update.download_progress_format":  "Download progress: {0:F0}%",
+    "settings.update.status_ready":  "Ready to check for updates.",
+    "settings.update.status_channel_changed":  "Update channel changed. Please check again.",
+    "settings.update.status_channel_changed_format":  "Update channel switched to {0}. Please check again.",
+    "settings.update.status_windows_only":  "Automatic installer update is currently available only on Windows.",
+    "settings.update.status_checking":  "Checking GitHub releases...",
+    "settings.update.status_check_failed_format":  "Update check failed: {0}",
+    "settings.update.status_up_to_date":  "You are already on the latest version.",
+    "settings.update.status_asset_missing":  "A new release is available, but no compatible installer was found.",
+    "settings.update.status_available_format":  "New version {0} is available. Click Download & Install.",
+    "settings.update.status_downloading":  "Downloading installer...",
+    "settings.update.status_download_failed_format":  "Download failed: {0}",
+    "settings.update.status_launching_installer":  "Download complete. Launching installer...",
+    "settings.update.status_installer_missing":  "Installer file was not found after download.",
+    "settings.update.status_installer_started":  "Installer started. The app will close for update.",
+    "settings.update.status_launch_failed_format":  "Failed to start installer: {0}",
     "settings.about.title":  "About",
     "settings.about.version_format":  "Version: {0}",
     "settings.about.codename_format":  "Code Name: {0}",
@@ -210,6 +243,7 @@
     "common.night":  "Night",
     "common.back":  "Back",
     "common.close":  "Close",
+    "common.unknown":  "Unknown error",
     "common.recommended":  "Recommended",
     "common.monet":  "Monet",
     "desktop.page_index_format":  "Desktop {0}",
@@ -231,6 +265,7 @@
     "component_category.board":  "Board",
     "component_category.media":  "Media",
     "component_category.info":  "Info",
+    "component_category.calculator":  "Calculator",
     "component_category.study":  "Study",
     "component.date":  "Calendar",
     "component.month_calendar":  "Month Calendar",
@@ -248,6 +283,10 @@
     "component.audio_recorder":  "Recorder",
     "component.daily_poetry":  "Daily Poetry",
     "component.daily_artwork":  "Daily Artwork",
+    "component.daily_word":  "Daily Word",
+    "component.cnr_daily_news":  "CNR Headlines",
+    "component.bilibili_hot_search":  "Bilibili Hot Search",
+    "component.exchange_rate_converter":  "Exchange Rate Converter",
     "component.whiteboard":  "Blackboard (Portrait)",
     "component.blackboard_landscape":  "Blackboard (Landscape)",
     "component.browser":  "Browser",
@@ -280,6 +319,47 @@
     "artwork.widget.fallback_artist":  "Recommendation service unavailable",
     "artwork.widget.fallback_year":  "Try again later",
     "artwork.widget.unknown_artist":  "Unknown artist",
+    "dailyword.widget.loading":  "Loading...",
+    "dailyword.widget.loading_word":  "daily word",
+    "dailyword.widget.loading_pronunciation":  "Fetching pronunciation...",
+    "dailyword.widget.loading_meaning":  "Fetching meaning...",
+    "dailyword.widget.loading_example":  "Fetching example sentence...",
+    "dailyword.widget.loading_example_translation":  "Loading...",
+    "dailyword.widget.fetch_failed":  "Daily word fetch failed",
+    "dailyword.widget.fallback_word":  "daily word",
+    "dailyword.widget.fallback_pronunciation":  "Pronunciation unavailable",
+    "dailyword.widget.fallback_meaning":  "Youdao dictionary is temporarily unavailable.",
+    "dailyword.widget.fallback_example":  "Tap the refresh button and try again.",
+    "dailyword.widget.fallback_example_translation":  "It will retry when network recovers.",
+    "cnrnews.widget.loading":  "Loading...",
+    "cnrnews.widget.loading_title":  "Fetching CNR headlines",
+    "cnrnews.widget.loading_subtitle":  "Please wait",
+    "cnrnews.widget.fetch_failed":  "News fetch failed",
+    "cnrnews.widget.fallback_title":  "CNR news is temporarily unavailable",
+    "cnrnews.widget.fallback_subtitle":  "Tap refresh and try again",
+    "cnrnews.widget.hot_label":  "Hot",
+    "bilihot.widget.brand":  "bilibili hot search",
+    "bilihot.widget.top_right_label":  "bilibili热搜",
+    "bilihot.widget.search_entry":  "Search",
+    "bilihot.widget.search_placeholder":  "Search trending topics",
+    "bilihot.widget.loading":  "Loading...",
+    "bilihot.widget.loading_item":  "Loading...",
+    "bilihot.widget.fetch_failed":  "Hot search fetch failed",
+    "bilihot.widget.fallback_item":  "No hot search data",
+    "bilihot.widget.more_hot":  "More hot search",
+    "exchange.widget.loading":  "Loading exchange rates...",
+    "exchange.widget.fetch_failed":  "Exchange rate fetch failed",
+    "cnrnews.settings.title":  "CNR Settings",
+    "cnrnews.settings.desc":  "Configure auto-rotation and refresh interval.",
+    "cnrnews.settings.auto_rotate_label":  "Auto-rotation",
+    "cnrnews.settings.auto_rotate_enabled":  "Enable auto-rotation",
+    "cnrnews.settings.frequency_label":  "Rotation interval",
+    "cnrnews.settings.frequency_5m":  "5 minutes",
+    "cnrnews.settings.frequency_10m":  "10 minutes",
+    "cnrnews.settings.frequency_40m":  "40 minutes",
+    "cnrnews.settings.frequency_1h":  "1 hour",
+    "cnrnews.settings.frequency_12h":  "12 hours",
+    "cnrnews.settings.frequency_24h":  "24 hours",
     "artwork.settings.title":  "Daily Artwork Settings",
     "artwork.settings.desc":  "Switch the data source used by Daily Artwork.",
     "artwork.settings.source_label":  "Mirror Source",

LanMountainDesktop/Localization/zh-CN.json

@@ -12,6 +12,7 @@
     "settings.nav.status_bar":  "状态栏",
     "settings.nav.weather":  "天气",
     "settings.nav.region":  "地区",
+    "settings.nav.update":  "更新",
     "settings.nav.about":  "关于",
     "settings.wallpaper.title":  "壁纸",
     "settings.wallpaper.description":  "选择图片或视频后可立即设为应用窗口壁纸。",
@@ -195,6 +196,38 @@
     "settings.region.timezone_header":  "时区",
     "settings.region.timezone_desc":  "选择时区。时钟与日历组件会使用该时区。",
     "settings.region.applied_format":  "语言已切换为：{0}",
+    "settings.update.title":  "更新",
+    "settings.update.current_version_label":  "当前版本",
+    "settings.update.latest_version_label":  "最新发布",
+    "settings.update.published_at_label":  "发布时间",
+    "settings.update.options_header":  "更新选项",
+    "settings.update.options_desc":  "配置更新检查与发布通道。",
+    "settings.update.auto_check_toggle":  "启动时自动检查更新",
+    "settings.update.include_prerelease_toggle":  "包含预发布版本",
+    "settings.update.channel_label":  "更新通道",
+    "settings.update.channel_stable":  "正式版",
+    "settings.update.channel_preview":  "预览版",
+    "settings.update.actions_header":  "更新操作",
+    "settings.update.actions_desc":  "检查发布、下载安装包并启动更新。",
+    "settings.update.check_button":  "检查更新",
+    "settings.update.download_install_button":  "下载并安装",
+    "settings.update.download_progress_idle":  "下载进度：-",
+    "settings.update.download_progress_format":  "下载进度：{0:F0}%",
+    "settings.update.status_ready":  "可开始检查更新。",
+    "settings.update.status_channel_changed":  "更新通道已变更，请重新检查更新。",
+    "settings.update.status_channel_changed_format":  "更新通道已切换为 {0}，请重新检查更新。",
+    "settings.update.status_windows_only":  "自动安装包更新当前仅支持 Windows。",
+    "settings.update.status_checking":  "正在检查 GitHub Release...",
+    "settings.update.status_check_failed_format":  "检查更新失败：{0}",
+    "settings.update.status_up_to_date":  "当前已是最新版本。",
+    "settings.update.status_asset_missing":  "发现新版本，但未找到兼容的安装包。",
+    "settings.update.status_available_format":  "发现新版本 {0}，点击“下载并安装”继续。",
+    "settings.update.status_downloading":  "正在下载安装包...",
+    "settings.update.status_download_failed_format":  "下载失败：{0}",
+    "settings.update.status_launching_installer":  "下载完成，正在启动安装程序...",
+    "settings.update.status_installer_missing":  "下载后未找到安装包文件。",
+    "settings.update.status_installer_started":  "安装程序已启动，应用将关闭进行更新。",
+    "settings.update.status_launch_failed_format":  "启动安装程序失败：{0}",
     "settings.about.title":  "关于",
     "settings.about.version_format":  "版本号: {0}",
     "settings.about.codename_format":  "版本代号: {0}",
@@ -210,6 +243,7 @@
     "common.night":  "夜间",
     "common.back":  "返回",
     "common.close":  "关闭",
+    "common.unknown":  "未知错误",
     "common.recommended":  "推荐",
     "common.monet":  "莫奈",
     "desktop.page_index_format":  "桌面 {0}",
@@ -231,6 +265,7 @@
     "component_category.board":  "白板",
     "component_category.media":  "媒体",
     "component_category.info":  "信息推荐",
+    "component_category.calculator":  "计算器",
     "component_category.study":  "自习",
     "component.date":  "日历",
     "component.month_calendar":  "月历",
@@ -248,6 +283,10 @@
     "component.audio_recorder":  "录音",
     "component.daily_poetry":  "每日诗词",
     "component.daily_artwork":  "每日名画",
+    "component.daily_word":  "每日单词",
+    "component.cnr_daily_news":  "央广网头条",
+    "component.bilibili_hot_search":  "B站热搜",
+    "component.exchange_rate_converter":  "汇率换算",
     "component.whiteboard":  "竖向小黑板",
     "component.blackboard_landscape":  "横向小黑板",
     "component.browser":  "浏览器",
@@ -280,6 +319,47 @@
     "artwork.widget.fallback_artist":  "推荐服务不可用",
     "artwork.widget.fallback_year":  "稍后重试",
     "artwork.widget.unknown_artist":  "未知作者",
+    "dailyword.widget.loading":  "加载中...",
+    "dailyword.widget.loading_word":  "每日单词",
+    "dailyword.widget.loading_pronunciation":  "正在获取发音",
+    "dailyword.widget.loading_meaning":  "正在获取释义",
+    "dailyword.widget.loading_example":  "正在获取例句",
+    "dailyword.widget.loading_example_translation":  "加载中",
+    "dailyword.widget.fetch_failed":  "每日单词获取失败",
+    "dailyword.widget.fallback_word":  "每日单词",
+    "dailyword.widget.fallback_pronunciation":  "发音暂不可用",
+    "dailyword.widget.fallback_meaning":  "有道词典暂不可用",
+    "dailyword.widget.fallback_example":  "请点击右上角刷新重试",
+    "dailyword.widget.fallback_example_translation":  "网络恢复后将自动更新",
+    "cnrnews.widget.loading":  "加载中...",
+    "cnrnews.widget.loading_title":  "正在获取新闻热点",
+    "cnrnews.widget.loading_subtitle":  "请稍候",
+    "cnrnews.widget.fetch_failed":  "新闻获取失败",
+    "cnrnews.widget.fallback_title":  "央广网新闻暂不可用",
+    "cnrnews.widget.fallback_subtitle":  "点击右上角稍后重试",
+    "cnrnews.widget.hot_label":  "热点",
+    "bilihot.widget.brand":  "bilibili 热搜",
+    "bilihot.widget.top_right_label":  "bilibili热搜",
+    "bilihot.widget.search_entry":  "搜索",
+    "bilihot.widget.search_placeholder":  "搜索热词",
+    "bilihot.widget.loading":  "加载中...",
+    "bilihot.widget.loading_item":  "加载中...",
+    "bilihot.widget.fetch_failed":  "热搜获取失败",
+    "bilihot.widget.fallback_item":  "暂无热搜",
+    "bilihot.widget.more_hot":  "更多热搜",
+    "exchange.widget.loading":  "正在加载汇率...",
+    "exchange.widget.fetch_failed":  "汇率获取失败",
+    "cnrnews.settings.title":  "央广网设置",
+    "cnrnews.settings.desc":  "配置新闻自动轮换与刷新频率。",
+    "cnrnews.settings.auto_rotate_label":  "自动轮换",
+    "cnrnews.settings.auto_rotate_enabled":  "启用自动轮换",
+    "cnrnews.settings.frequency_label":  "轮换频率",
+    "cnrnews.settings.frequency_5m":  "5 分钟",
+    "cnrnews.settings.frequency_10m":  "10 分钟",
+    "cnrnews.settings.frequency_40m":  "40 分钟",
+    "cnrnews.settings.frequency_1h":  "1 小时",
+    "cnrnews.settings.frequency_12h":  "12 小时",
+    "cnrnews.settings.frequency_24h":  "24 小时",
     "artwork.settings.title":  "每日图片设置",
     "artwork.settings.desc":  "切换每日图片的数据源。",
     "artwork.settings.source_label":  "镜像源",

LanMountainDesktop/Models/AppSettingsSnapshot.cs

@@ -48,6 +48,12 @@ public sealed class AppSettingsSnapshot
 
     public bool AutoStartWithWindows { get; set; }
 
+    public bool AutoCheckUpdates { get; set; } = true;
+
+    public bool IncludePrereleaseUpdates { get; set; }
+
+    public string UpdateChannel { get; set; } = string.Empty;
+
     public List<string> TopStatusComponentIds { get; set; } = [];
 
     public List<string> PinnedTaskbarActions { get; set; } =
@@ -92,6 +98,10 @@ public sealed class AppSettingsSnapshot
     ];
     public string WorldClockSecondHandMode { get; set; } = "Tick";
 
+    public bool CnrDailyNewsAutoRotateEnabled { get; set; } = true;
+
+    public int CnrDailyNewsAutoRotateIntervalMinutes { get; set; } = 60;
+
     public AppSettingsSnapshot Clone()
     {
         var clone = (AppSettingsSnapshot)MemberwiseClone();

LanMountainDesktop/Models/RecommendationDataModels.cs

@@ -1,4 +1,5 @@
-using System;
+using System;
+using System.Collections.Generic;
 
 namespace LanMountainDesktop.Models;
 
@@ -20,3 +21,52 @@ public sealed record DailyPoetrySnapshot(
     string? Author,
     string? Category,
     DateTimeOffset FetchedAt);
+
+public sealed record DailyNewsItemSnapshot(
+    string Title,
+    string? Summary,
+    string Url,
+    string? ImageUrl,
+    string? PublishTime);
+
+public sealed record DailyNewsSnapshot(
+    string Provider,
+    string Source,
+    IReadOnlyList<DailyNewsItemSnapshot> Items,
+    DateTimeOffset FetchedAt);
+
+public sealed record BilibiliHotSearchItemSnapshot(
+    string Title,
+    string Keyword,
+    string Url,
+    long? HeatScore,
+    bool HasHotTag,
+    string? IconUrl);
+
+public sealed record BilibiliHotSearchSnapshot(
+    string Provider,
+    string Source,
+    string SearchPlaceholder,
+    string SearchUrl,
+    string MoreHotUrl,
+    IReadOnlyList<BilibiliHotSearchItemSnapshot> Items,
+    DateTimeOffset FetchedAt);
+
+public sealed record DailyWordSnapshot(
+    string Provider,
+    string Word,
+    string? UkPronunciation,
+    string? UsPronunciation,
+    string Meaning,
+    string? ExampleSentence,
+    string? ExampleTranslation,
+    string? SourceUrl,
+    DateTimeOffset FetchedAt);
+
+public sealed record ExchangeRateSnapshot(
+    string Provider,
+    string Source,
+    string BaseCurrency,
+    string TargetCurrency,
+    decimal Rate,
+    DateTimeOffset FetchedAt);

LanMountainDesktop/Services/CalculatorDataService.cs

@@ -0,0 +1,123 @@
+using System;
+using System.Globalization;
+
+namespace LanMountainDesktop.Services;
+
+public sealed class CalculatorDataService : ICalculatorDataService
+{
+    private const int MaxInputLength = 18;
+
+    public string ApplyInputToken(string currentInput, string token)
+    {
+        var normalized = NormalizeInput(currentInput);
+        if (string.IsNullOrWhiteSpace(token))
+        {
+            return normalized;
+        }
+
+        if (string.Equals(token, CalculatorInputTokens.Clear, StringComparison.OrdinalIgnoreCase))
+        {
+            return "0";
+        }
+
+        if (string.Equals(token, CalculatorInputTokens.Backspace, StringComparison.OrdinalIgnoreCase))
+        {
+            if (normalized.Length <= 1)
+            {
+                return "0";
+            }
+
+            var trimmed = normalized[..^1];
+            if (trimmed is "-" or "" or "-0")
+            {
+                return "0";
+            }
+
+            return trimmed;
+        }
+
+        if (string.Equals(token, CalculatorInputTokens.DecimalPoint, StringComparison.Ordinal))
+        {
+            if (normalized.Contains('.', StringComparison.Ordinal))
+            {
+                return normalized;
+            }
+
+            if (normalized.Length >= MaxInputLength)
+            {
+                return normalized;
+            }
+
+            return $"{normalized}.";
+        }
+
+        if (token is "00")
+        {
+            if (normalized == "0")
+            {
+                return "0";
+            }
+
+            if (normalized.Length + 2 > MaxInputLength)
+            {
+                return normalized;
+            }
+
+            return normalized + "00";
+        }
+
+        if (token.Length == 1 && char.IsDigit(token[0]))
+        {
+            if (normalized == "0")
+            {
+                return token;
+            }
+
+            if (normalized.Length >= MaxInputLength)
+            {
+                return normalized;
+            }
+
+            return normalized + token;
+        }
+
+        return normalized;
+    }
+
+    public decimal ParseAmountOrZero(string? inputText)
+    {
+        var normalized = NormalizeInput(inputText);
+        if (decimal.TryParse(
+            normalized,
+            NumberStyles.AllowLeadingSign | NumberStyles.AllowDecimalPoint,
+            CultureInfo.InvariantCulture,
+            out var amount))
+        {
+            return amount;
+        }
+
+        return 0m;
+    }
+
+    public string FormatAmount(decimal amount, int maxFractionDigits = 4)
+    {
+        var safeDigits = Math.Clamp(maxFractionDigits, 0, 8);
+        var pattern = safeDigits == 0 ? "0" : $"0.{new string('#', safeDigits)}";
+        return amount.ToString(pattern, CultureInfo.InvariantCulture);
+    }
+
+    private static string NormalizeInput(string? input)
+    {
+        if (string.IsNullOrWhiteSpace(input))
+        {
+            return "0";
+        }
+
+        var trimmed = input.Trim();
+        return trimmed switch
+        {
+            "-" or "-0" => "0",
+            _ => trimmed
+        };
+    }
+}

LanMountainDesktop/Services/GitHubReleaseUpdateService.cs

@@ -0,0 +1,482 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Net.Http;
+using System.Runtime.InteropServices;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace LanMountainDesktop.Services;
+
+public sealed record GitHubReleaseAsset(
+    string Name,
+    string BrowserDownloadUrl,
+    long SizeBytes);
+
+public sealed record GitHubReleaseInfo(
+    string TagName,
+    string Name,
+    bool IsPrerelease,
+    bool IsDraft,
+    DateTimeOffset PublishedAt,
+    IReadOnlyList<GitHubReleaseAsset> Assets);
+
+public sealed record UpdateCheckResult(
+    bool Success,
+    bool IsUpdateAvailable,
+    string CurrentVersionText,
+    string LatestVersionText,
+    GitHubReleaseInfo? Release,
+    GitHubReleaseAsset? PreferredAsset,
+    string? ErrorMessage);
+
+public sealed record UpdateDownloadResult(
+    bool Success,
+    string? FilePath,
+    string? ErrorMessage);
+
+public sealed class GitHubReleaseUpdateService : IDisposable
+{
+    private const string GithubApiVersion = "2022-11-28";
+
+    private readonly string _owner;
+    private readonly string _repo;
+    private readonly HttpClient _httpClient;
+    private readonly bool _ownsHttpClient;
+
+    public GitHubReleaseUpdateService(
+        string owner,
+        string repo,
+        HttpClient? httpClient = null)
+    {
+        _owner = owner?.Trim() ?? string.Empty;
+        _repo = repo?.Trim() ?? string.Empty;
+
+        if (httpClient is null)
+        {
+            _httpClient = new HttpClient
+            {
+                Timeout = TimeSpan.FromSeconds(20)
+            };
+            _ownsHttpClient = true;
+        }
+        else
+        {
+            _httpClient = httpClient;
+            _ownsHttpClient = false;
+        }
+
+        if (!_httpClient.DefaultRequestHeaders.UserAgent.Any())
+        {
+            _httpClient.DefaultRequestHeaders.UserAgent.ParseAdd("LanMountainDesktop-Updater/1.0");
+        }
+
+        if (!_httpClient.DefaultRequestHeaders.Accept.Any())
+        {
+            _httpClient.DefaultRequestHeaders.Accept.ParseAdd("application/vnd.github+json");
+        }
+
+        if (!_httpClient.DefaultRequestHeaders.Contains("X-GitHub-Api-Version"))
+        {
+            _httpClient.DefaultRequestHeaders.Add("X-GitHub-Api-Version", GithubApiVersion);
+        }
+    }
+
+    public void Dispose()
+    {
+        if (_ownsHttpClient)
+        {
+            _httpClient.Dispose();
+        }
+    }
+
+    public async Task<UpdateCheckResult> CheckForUpdatesAsync(
+        Version currentVersion,
+        bool includePrerelease,
+        CancellationToken cancellationToken = default)
+    {
+        var normalizedCurrentVersionText = NormalizeVersion(currentVersion).ToString(3);
+
+        if (string.IsNullOrWhiteSpace(_owner) || string.IsNullOrWhiteSpace(_repo))
+        {
+            return new UpdateCheckResult(
+                Success: false,
+                IsUpdateAvailable: false,
+                CurrentVersionText: normalizedCurrentVersionText,
+                LatestVersionText: "-",
+                Release: null,
+                PreferredAsset: null,
+                ErrorMessage: "Repository information is not configured.");
+        }
+
+        try
+        {
+            var release = includePrerelease
+                ? await GetLatestReleaseIncludingPrereleaseAsync(cancellationToken)
+                : await GetLatestStableReleaseAsync(cancellationToken);
+
+            if (release is null)
+            {
+                return new UpdateCheckResult(
+                    Success: false,
+                    IsUpdateAvailable: false,
+                    CurrentVersionText: normalizedCurrentVersionText,
+                    LatestVersionText: "-",
+                    Release: null,
+                    PreferredAsset: null,
+                    ErrorMessage: "No release data was returned from GitHub.");
+            }
+
+            var hasParsedTagVersion = TryParseVersion(release.TagName, out var parsedTagVersion);
+            var latestVersionText = hasParsedTagVersion && parsedTagVersion is not null
+                ? parsedTagVersion.ToString(3)
+                : release.TagName;
+
+            var isUpdateAvailable = parsedTagVersion is not null && parsedTagVersion > currentVersion;
+            var preferredAsset = isUpdateAvailable
+                ? SelectPreferredInstallerAsset(release.Assets)
+                : null;
+
+            return new UpdateCheckResult(
+                Success: true,
+                IsUpdateAvailable: isUpdateAvailable,
+                CurrentVersionText: normalizedCurrentVersionText,
+                LatestVersionText: latestVersionText,
+                Release: release,
+                PreferredAsset: preferredAsset,
+                ErrorMessage: null);
+        }
+        catch (OperationCanceledException)
+        {
+            throw;
+        }
+        catch (Exception ex)
+        {
+            return new UpdateCheckResult(
+                Success: false,
+                IsUpdateAvailable: false,
+                CurrentVersionText: normalizedCurrentVersionText,
+                LatestVersionText: "-",
+                Release: null,
+                PreferredAsset: null,
+                ErrorMessage: ex.Message);
+        }
+    }
+
+    public async Task<UpdateDownloadResult> DownloadAssetAsync(
+        GitHubReleaseAsset asset,
+        string destinationFilePath,
+        IProgress<double>? progress = null,
+        CancellationToken cancellationToken = default)
+    {
+        if (asset is null)
+        {
+            return new UpdateDownloadResult(false, null, "Asset is null.");
+        }
+
+        if (string.IsNullOrWhiteSpace(asset.BrowserDownloadUrl))
+        {
+            return new UpdateDownloadResult(false, null, "Asset download url is empty.");
+        }
+
+        if (string.IsNullOrWhiteSpace(destinationFilePath))
+        {
+            return new UpdateDownloadResult(false, null, "Destination file path is empty.");
+        }
+
+        try
+        {
+            var directory = Path.GetDirectoryName(destinationFilePath);
+            if (!string.IsNullOrWhiteSpace(directory))
+            {
+                Directory.CreateDirectory(directory);
+            }
+
+            using var response = await _httpClient.GetAsync(
+                asset.BrowserDownloadUrl,
+                HttpCompletionOption.ResponseHeadersRead,
+                cancellationToken);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                return new UpdateDownloadResult(
+                    false,
+                    null,
+                    $"HTTP {(int)response.StatusCode}: {response.ReasonPhrase}");
+            }
+
+            var contentLength = response.Content.Headers.ContentLength ??
+                                (asset.SizeBytes > 0 ? asset.SizeBytes : -1);
+
+            await using var sourceStream = await response.Content.ReadAsStreamAsync(cancellationToken);
+            await using var destinationStream = File.Create(destinationFilePath);
+
+            var buffer = new byte[81920];
+            long totalRead = 0;
+            int read;
+            while ((read = await sourceStream.ReadAsync(buffer, cancellationToken)) > 0)
+            {
+                await destinationStream.WriteAsync(buffer.AsMemory(0, read), cancellationToken);
+                totalRead += read;
+
+                if (contentLength > 0)
+                {
+                    progress?.Report(Math.Clamp(totalRead / (double)contentLength, 0d, 1d));
+                }
+            }
+
+            progress?.Report(1d);
+
+            return new UpdateDownloadResult(true, destinationFilePath, null);
+        }
+        catch (OperationCanceledException)
+        {
+            throw;
+        }
+        catch (Exception ex)
+        {
+            return new UpdateDownloadResult(false, null, ex.Message);
+        }
+    }
+
+    private async Task<GitHubReleaseInfo?> GetLatestStableReleaseAsync(CancellationToken cancellationToken)
+    {
+        var url = $"https://api.github.com/repos/{_owner}/{_repo}/releases/latest";
+        var responseText = await GetResponseTextAsync(url, cancellationToken);
+
+        using var document = JsonDocument.Parse(responseText);
+        return ParseRelease(document.RootElement);
+    }
+
+    private async Task<GitHubReleaseInfo?> GetLatestReleaseIncludingPrereleaseAsync(CancellationToken cancellationToken)
+    {
+        var url = $"https://api.github.com/repos/{_owner}/{_repo}/releases?per_page=20";
+        var responseText = await GetResponseTextAsync(url, cancellationToken);
+
+        using var document = JsonDocument.Parse(responseText);
+        if (document.RootElement.ValueKind != JsonValueKind.Array)
+        {
+            return null;
+        }
+
+        foreach (var item in document.RootElement.EnumerateArray())
+        {
+            var release = ParseRelease(item);
+            if (release is null || release.IsDraft)
+            {
+                continue;
+            }
+
+            return release;
+        }
+
+        return null;
+    }
+
+    private async Task<string> GetResponseTextAsync(string url, CancellationToken cancellationToken)
+    {
+        using var response = await _httpClient.GetAsync(url, cancellationToken);
+        var responseText = await response.Content.ReadAsStringAsync(cancellationToken);
+
+        if (!response.IsSuccessStatusCode)
+        {
+            throw new InvalidOperationException(
+                $"GitHub API request failed with HTTP {(int)response.StatusCode}: {Truncate(responseText, 180)}");
+        }
+
+        return responseText;
+    }
+
+    private static GitHubReleaseInfo? ParseRelease(JsonElement element)
+    {
+        if (element.ValueKind != JsonValueKind.Object)
+        {
+            return null;
+        }
+
+        var tagName = element.TryGetProperty("tag_name", out var tagNode)
+            ? tagNode.GetString()?.Trim()
+            : null;
+
+        if (string.IsNullOrWhiteSpace(tagName))
+        {
+            return null;
+        }
+
+        var name = element.TryGetProperty("name", out var nameNode)
+            ? nameNode.GetString()?.Trim() ?? string.Empty
+            : string.Empty;
+
+        var isPrerelease = element.TryGetProperty("prerelease", out var prereleaseNode) &&
+                           prereleaseNode.ValueKind == JsonValueKind.True;
+
+        var isDraft = element.TryGetProperty("draft", out var draftNode) &&
+                      draftNode.ValueKind == JsonValueKind.True;
+
+        var publishedAt = DateTimeOffset.MinValue;
+        if (element.TryGetProperty("published_at", out var publishedAtNode) &&
+            publishedAtNode.ValueKind == JsonValueKind.String)
+        {
+            var publishedAtText = publishedAtNode.GetString();
+            if (!string.IsNullOrWhiteSpace(publishedAtText) &&
+                DateTimeOffset.TryParse(
+                    publishedAtText,
+                    CultureInfo.InvariantCulture,
+                    DateTimeStyles.AssumeUniversal,
+                    out var parsedPublishedAt))
+            {
+                publishedAt = parsedPublishedAt;
+            }
+        }
+
+        var assets = new List<GitHubReleaseAsset>();
+        if (element.TryGetProperty("assets", out var assetsNode) && assetsNode.ValueKind == JsonValueKind.Array)
+        {
+            foreach (var assetNode in assetsNode.EnumerateArray())
+            {
+                if (assetNode.ValueKind != JsonValueKind.Object)
+                {
+                    continue;
+                }
+
+                var assetName = assetNode.TryGetProperty("name", out var assetNameNode)
+                    ? assetNameNode.GetString()?.Trim()
+                    : null;
+                var browserDownloadUrl = assetNode.TryGetProperty("browser_download_url", out var urlNode)
+                    ? urlNode.GetString()?.Trim()
+                    : null;
+                var sizeBytes = assetNode.TryGetProperty("size", out var sizeNode) && sizeNode.TryGetInt64(out var size)
+                    ? size
+                    : 0L;
+
+                if (string.IsNullOrWhiteSpace(assetName) || string.IsNullOrWhiteSpace(browserDownloadUrl))
+                {
+                    continue;
+                }
+
+                assets.Add(new GitHubReleaseAsset(assetName, browserDownloadUrl, sizeBytes));
+            }
+        }
+
+        return new GitHubReleaseInfo(tagName, name, isPrerelease, isDraft, publishedAt, assets);
+    }
+
+    private static GitHubReleaseAsset? SelectPreferredInstallerAsset(IReadOnlyList<GitHubReleaseAsset> assets)
+    {
+        if (assets is null || assets.Count == 0 || !OperatingSystem.IsWindows())
+        {
+            return null;
+        }
+
+        var architectureToken = RuntimeInformation.OSArchitecture switch
+        {
+            Architecture.Arm64 => "arm64",
+            Architecture.X86 => "x86",
+            _ => "x64"
+        };
+
+        var ranked = assets
+            .Select(asset => (Asset: asset, Score: ScoreWindowsInstallerAsset(asset.Name, architectureToken)))
+            .OrderByDescending(x => x.Score)
+            .ToList();
+
+        return ranked.FirstOrDefault(x => x.Score > 0).Asset;
+    }
+
+    private static int ScoreWindowsInstallerAsset(string assetName, string architectureToken)
+    {
+        if (string.IsNullOrWhiteSpace(assetName))
+        {
+            return 0;
+        }
+
+        var score = 0;
+
+        if (assetName.EndsWith(".exe", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 200;
+        }
+        else if (assetName.EndsWith(".msi", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 160;
+        }
+        else
+        {
+            return 0;
+        }
+
+        if (assetName.Contains("setup", StringComparison.OrdinalIgnoreCase) ||
+            assetName.Contains("installer", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 60;
+        }
+
+        if (assetName.Contains(architectureToken, StringComparison.OrdinalIgnoreCase))
+        {
+            score += 40;
+        }
+        else if (assetName.Contains("x64", StringComparison.OrdinalIgnoreCase) ||
+                 assetName.Contains("x86", StringComparison.OrdinalIgnoreCase) ||
+                 assetName.Contains("arm64", StringComparison.OrdinalIgnoreCase))
+        {
+            score -= 30;
+        }
+
+        if (assetName.Contains("portable", StringComparison.OrdinalIgnoreCase))
+        {
+            score -= 40;
+        }
+
+        return score;
+    }
+
+    private static bool TryParseVersion(string? value, out Version? version)
+    {
+        version = null;
+        if (string.IsNullOrWhiteSpace(value))
+        {
+            return false;
+        }
+
+        var normalized = value.Trim();
+        if (normalized.StartsWith("v", StringComparison.OrdinalIgnoreCase))
+        {
+            normalized = normalized[1..];
+        }
+
+        var separatorIndex = normalized.IndexOfAny(['-', '+', ' ']);
+        if (separatorIndex > 0)
+        {
+            normalized = normalized[..separatorIndex];
+        }
+
+        if (!Version.TryParse(normalized, out var parsed))
+        {
+            return false;
+        }
+
+        version = NormalizeVersion(parsed);
+        return true;
+    }
+
+    private static Version NormalizeVersion(Version version)
+    {
+        var major = Math.Max(0, version.Major);
+        var minor = Math.Max(0, version.Minor);
+        var build = Math.Max(0, version.Build);
+        return new Version(major, minor, build);
+    }
+
+    private static string Truncate(string value, int maxLength)
+    {
+        if (string.IsNullOrEmpty(value) || value.Length <= maxLength)
+        {
+            return value;
+        }
+
+        return value[..maxLength];
+    }
+}

LanMountainDesktop/Services/ICalculatorDataService.cs

@@ -0,0 +1,17 @@
+namespace LanMountainDesktop.Services;
+
+public interface ICalculatorDataService
+{
+    string ApplyInputToken(string currentInput, string token);
+
+    decimal ParseAmountOrZero(string? inputText);
+
+    string FormatAmount(decimal amount, int maxFractionDigits = 4);
+}
+
+public static class CalculatorInputTokens
+{
+    public const string Clear = "AC";
+    public const string Backspace = "BACK";
+    public const string DecimalPoint = ".";
+}

LanMountainDesktop/Services/IRecommendationDataService.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
 using LanMountainDesktop.Models;
@@ -14,6 +15,25 @@ public sealed record DailyPoetryQuery(
     string? Locale = null,
     bool ForceRefresh = false);
 
+public sealed record DailyNewsQuery(
+    string? Locale = null,
+    int? ItemCount = null,
+    bool ForceRefresh = false);
+
+public sealed record BilibiliHotSearchQuery(
+    string? Locale = null,
+    int? ItemCount = null,
+    bool ForceRefresh = false);
+
+public sealed record DailyWordQuery(
+    string? Locale = null,
+    bool ForceRefresh = false);
+
+public sealed record ExchangeRateQuery(
+    string? BaseCurrency = null,
+    string? TargetCurrency = null,
+    bool ForceRefresh = false);
+
 public sealed record RecommendationQueryResult<T>(
     bool Success,
     T? Data,
@@ -46,11 +66,166 @@ public sealed record RecommendationApiOptions
 
     public string DomesticArtworkHost { get; init; } = "https://cn.bing.com";
 
+    public string CnrDailyNewsListUrl { get; init; } = "https://www.cnr.cn/newscenter/native/gd/";
+
+    public IReadOnlyList<string> CnrDailyNewsRssFeedUrls { get; init; } =
+    [
+        "https://www.cnr.cn/rss.xml",
+        "https://news.cnr.cn/rss.xml",
+        "https://www.cnr.cn/newscenter/native/gd/rss.xml",
+        "https://news.cnr.cn/native/gd/rss.xml"
+    ];
+
+    public string BilibiliHotSearchApiTemplate { get; init; } =
+        "https://api.bilibili.com/x/web-interface/search/square?limit={0}";
+
+    public string BilibiliSearchDefaultApiUrl { get; init; } =
+        "https://api.bilibili.com/x/web-interface/search/default";
+
+    public string BilibiliSearchPageUrl { get; init; } = "https://search.bilibili.com/all";
+
+    public string YoudaoDictionaryApiTemplate { get; init; } = "https://dict.youdao.com/jsonapi?q={0}";
+
+    public string YoudaoDictionaryWordPageTemplate { get; init; } = "https://dict.youdao.com/w/eng/{0}/";
+
+    public string ExchangeRateApiTemplate { get; init; } = "https://open.er-api.com/v6/latest/{0}";
+
+    public IReadOnlyList<string> YoudaoDailyWordCandidates { get; init; } =
+    [
+        "illustrate",
+        "resilient",
+        "meticulous",
+        "coherent",
+        "subtle",
+        "constrain",
+        "tangible",
+        "versatile",
+        "pragmatic",
+        "derive",
+        "intricate",
+        "notion",
+        "facilitate",
+        "sustain",
+        "clarify",
+        "convey",
+        "nuance",
+        "transform",
+        "navigate",
+        "align",
+        "elevate",
+        "refine",
+        "vivid",
+        "compile",
+        "inspect",
+        "aggregate",
+        "optimize",
+        "resonate",
+        "persist",
+        "adapt",
+        "emerge",
+        "concrete",
+        "articulate",
+        "validate",
+        "insight",
+        "concise",
+        "robust",
+        "reliable",
+        "spectrum",
+        "landscape",
+        "context",
+        "constraint",
+        "iterative",
+        "foundation",
+        "priority",
+        "workflow",
+        "synthesize",
+        "anchor",
+        "precision",
+        "momentum",
+        "integrate",
+        "observe",
+        "structure",
+        "essence",
+        "framework",
+        "drift",
+        "discern",
+        "compose",
+        "modulate",
+        "stability",
+        "trajectory",
+        "analyze",
+        "diagnose",
+        "mitigate",
+        "transparent",
+        "progressive",
+        "boundary",
+        "allocate",
+        "evaluate",
+        "reconcile",
+        "strategic",
+        "holistic",
+        "incremental",
+        "temporal",
+        "semantic",
+        "parallel",
+        "explicit",
+        "objective",
+        "capacity",
+        "durable",
+        "scalable",
+        "residual",
+        "verify",
+        "discover",
+        "curate",
+        "invoke",
+        "artistry",
+        "sincere",
+        "substantive",
+        "deliberate",
+        "dynamic",
+        "intentional",
+        "initiative",
+        "evidence",
+        "infuse",
+        "harmony",
+        "vitality",
+        "polish",
+        "portrait",
+        "rhythm",
+        "accent",
+        "gradient",
+        "palette",
+        "pattern",
+        "eclipse",
+        "horizon",
+        "luminous",
+        "serene",
+        "vantage",
+        "kinetic",
+        "refactor",
+        "calibrate",
+        "orchestrate",
+        "prototype",
+        "curiosity",
+        "discipline",
+        "inscribe",
+        "engage",
+        "spark",
+        "zenith",
+        "clarity",
+        "resolve",
+        "aptitude"
+    ];
+
     public TimeSpan CacheDuration { get; init; } = TimeSpan.FromMinutes(20);
 
     public TimeSpan RequestTimeout { get; init; } = TimeSpan.FromSeconds(8);
 
     public int DefaultArtworkCandidateCount { get; init; } = 50;
+
+    public int DefaultDailyNewsCount { get; init; } = 2;
+
+    public int DefaultBilibiliHotSearchCount { get; init; } = 5;
 }
 
 public interface IRecommendationInfoService
@@ -63,5 +238,21 @@ public interface IRecommendationInfoService
         DailyPoetryQuery query,
         CancellationToken cancellationToken = default);
 
+    Task<RecommendationQueryResult<DailyNewsSnapshot>> GetDailyNewsAsync(
+        DailyNewsQuery query,
+        CancellationToken cancellationToken = default);
+
+    Task<RecommendationQueryResult<BilibiliHotSearchSnapshot>> GetBilibiliHotSearchAsync(
+        BilibiliHotSearchQuery query,
+        CancellationToken cancellationToken = default);
+
+    Task<RecommendationQueryResult<DailyWordSnapshot>> GetDailyWordAsync(
+        DailyWordQuery query,
+        CancellationToken cancellationToken = default);
+
+    Task<RecommendationQueryResult<ExchangeRateSnapshot>> GetExchangeRateAsync(
+        ExchangeRateQuery query,
+        CancellationToken cancellationToken = default);
+
     void ClearCache();
 }

LanMountainDesktop/Views/Components/BilibiliHotSearchWidget.axaml

@@ -0,0 +1,196 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:fi="using:FluentIcons.Avalonia"
+             mc:Ignorable="d"
+             d:DesignWidth="640"
+             d:DesignHeight="320"
+             x:Class="LanMountainDesktop.Views.Components.BilibiliHotSearchWidget">
+
+    <Border x:Name="RootBorder"
+            CornerRadius="34"
+            Background="Transparent"
+            ClipToBounds="True"
+            BorderThickness="0"
+            Padding="0">
+        <Grid>
+            <Border x:Name="CardBorder"
+                    Background="#FCFCFD"
+                    CornerRadius="34"
+                    BorderBrush="Transparent"
+                    BorderThickness="0"
+                    Padding="16,14,16,14">
+                <Grid x:Name="ContentGrid"
+                      RowDefinitions="Auto,Auto,Auto,Auto,Auto"
+                      RowSpacing="6">
+                    <Grid x:Name="HeaderGrid"
+                          Grid.Row="0"
+                          ColumnDefinitions="Auto,*"
+                          ColumnSpacing="10">
+                        <Border x:Name="SearchBoxBorder"
+                                Height="38"
+                                CornerRadius="19"
+                                Background="#F1F2F4"
+                                BorderBrush="Transparent"
+                                BorderThickness="0"
+                                Padding="10,0"
+                                HorizontalAlignment="Left"
+                                PointerPressed="OnSearchBoxPointerPressed">
+                            <Grid ColumnDefinitions="Auto,Auto"
+                                  ColumnSpacing="6"
+                                  VerticalAlignment="Center">
+                                <fi:SymbolIcon x:Name="SearchGlyphIcon"
+                                               Symbol="Search"
+                                               IconVariant="Regular"
+                                               Foreground="#7A8088"
+                                               FontSize="17"
+                                               VerticalAlignment="Center" />
+                                <TextBlock x:Name="SearchEntryTextBlock"
+                                           Grid.Column="1"
+                                           Text="Search"
+                                           Foreground="#7A8088"
+                                           FontSize="18"
+                                           FontWeight="Medium"
+                                           VerticalAlignment="Center"
+                                           MaxLines="1"
+                                           TextTrimming="CharacterEllipsis" />
+                            </Grid>
+                        </Border>
+
+                        <TextBlock x:Name="TopRightTitleTextBlock"
+                                   Grid.Column="1"
+                                   Text="bilibili热搜"
+                                   Foreground="#F44C9F"
+                                   FontSize="24"
+                                   FontWeight="Bold"
+                                   HorizontalAlignment="Right"
+                                   VerticalAlignment="Center"
+                                   MaxLines="1"
+                                   TextTrimming="CharacterEllipsis" />
+                    </Grid>
+
+                    <Border x:Name="HotItem1Host"
+                            Grid.Row="1"
+                            Tag="0"
+                            Background="Transparent"
+                            Padding="0,2"
+                            PointerPressed="OnHotItemPointerPressed">
+                        <Grid x:Name="HotItem1Grid"
+                              ColumnDefinitions="Auto,*"
+                              ColumnSpacing="8">
+                            <TextBlock x:Name="HotItem1IndexTextBlock"
+                                       Text="1"
+                                       Foreground="#F44C9F"
+                                       FontSize="18"
+                                       FontWeight="Bold"
+                                       VerticalAlignment="Center"
+                                       HorizontalAlignment="Left" />
+                            <TextBlock x:Name="HotItem1TextBlock"
+                                       Grid.Column="1"
+                                       Text="Trending Topic"
+                                       Foreground="#202327"
+                                       FontSize="28"
+                                       FontWeight="SemiBold"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="1"
+                                       VerticalAlignment="Center" />
+                        </Grid>
+                    </Border>
+
+                    <Border x:Name="HotItem2Host"
+                            Grid.Row="2"
+                            Tag="1"
+                            Background="Transparent"
+                            Padding="0,2"
+                            PointerPressed="OnHotItemPointerPressed">
+                        <Grid x:Name="HotItem2Grid"
+                              ColumnDefinitions="Auto,*"
+                              ColumnSpacing="8">
+                            <TextBlock x:Name="HotItem2IndexTextBlock"
+                                       Text="2"
+                                       Foreground="#F44C9F"
+                                       FontSize="18"
+                                       FontWeight="Bold"
+                                       VerticalAlignment="Center"
+                                       HorizontalAlignment="Left" />
+                            <TextBlock x:Name="HotItem2TextBlock"
+                                       Grid.Column="1"
+                                       Text="Trending Topic"
+                                       Foreground="#202327"
+                                       FontSize="28"
+                                       FontWeight="SemiBold"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="1"
+                                       VerticalAlignment="Center" />
+                        </Grid>
+                    </Border>
+
+                    <Border x:Name="HotItem3Host"
+                            Grid.Row="3"
+                            Tag="2"
+                            Background="Transparent"
+                            Padding="0,2"
+                            PointerPressed="OnHotItemPointerPressed">
+                        <Grid x:Name="HotItem3Grid"
+                              ColumnDefinitions="Auto,*"
+                              ColumnSpacing="8">
+                            <TextBlock x:Name="HotItem3IndexTextBlock"
+                                       Text="3"
+                                       Foreground="#F44C9F"
+                                       FontSize="18"
+                                       FontWeight="Bold"
+                                       VerticalAlignment="Center"
+                                       HorizontalAlignment="Left" />
+                            <TextBlock x:Name="HotItem3TextBlock"
+                                       Grid.Column="1"
+                                       Text="Trending Topic"
+                                       Foreground="#202327"
+                                       FontSize="28"
+                                       FontWeight="SemiBold"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="1"
+                                       VerticalAlignment="Center" />
+                        </Grid>
+                    </Border>
+
+                    <Border x:Name="HotItem4Host"
+                            Grid.Row="4"
+                            Tag="3"
+                            Background="Transparent"
+                            Padding="0,2"
+                            PointerPressed="OnHotItemPointerPressed">
+                        <Grid x:Name="HotItem4Grid"
+                              ColumnDefinitions="Auto,*"
+                              ColumnSpacing="8">
+                            <TextBlock x:Name="HotItem4IndexTextBlock"
+                                       Text="4"
+                                       Foreground="#F44C9F"
+                                       FontSize="18"
+                                       FontWeight="Bold"
+                                       VerticalAlignment="Center"
+                                       HorizontalAlignment="Left" />
+                            <TextBlock x:Name="HotItem4TextBlock"
+                                       Grid.Column="1"
+                                       Text="Trending Topic"
+                                       Foreground="#202327"
+                                       FontSize="28"
+                                       FontWeight="SemiBold"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="1"
+                                       VerticalAlignment="Center" />
+                        </Grid>
+                    </Border>
+                </Grid>
+            </Border>
+
+            <TextBlock x:Name="StatusTextBlock"
+                       IsVisible="False"
+                       Text="Loading"
+                       Foreground="#6A6F77"
+                       FontSize="16"
+                       HorizontalAlignment="Center"
+                       VerticalAlignment="Center" />
+        </Grid>
+    </Border>
+</UserControl>

LanMountainDesktop/Views/Components/BilibiliHotSearchWidget.axaml.cs

@@ -0,0 +1,521 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Media;
+using Avalonia.Threading;
+using LanMountainDesktop.Models;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+public partial class BilibiliHotSearchWidget : UserControl, IDesktopComponentWidget, IRecommendationInfoAwareComponentWidget
+{
+    private static readonly Regex MultiWhitespaceRegex = new(@"\s+", RegexOptions.Compiled);
+    private static readonly FontFamily MiSansFontFamily = new("MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans");
+    private static readonly IRecommendationInfoService DefaultRecommendationService = new RecommendationDataService();
+
+    private const double BaseCellSize = 48d;
+    private const int BaseWidthCells = 4;
+    private const int BaseHeightCells = 2;
+    private const int MaxDisplayItemCount = 4;
+
+    private readonly DispatcherTimer _refreshTimer = new()
+    {
+        Interval = TimeSpan.FromMinutes(15)
+    };
+
+    private readonly AppSettingsService _settingsService = new();
+    private readonly LocalizationService _localizationService = new();
+    private readonly List<BilibiliHotSearchItemSnapshot> _activeItems = [];
+    private readonly List<HotItemVisual> _hotItemVisuals = [];
+
+    private IRecommendationInfoService _recommendationService = DefaultRecommendationService;
+    private CancellationTokenSource? _refreshCts;
+    private string _languageCode = "zh-CN";
+    private string? _searchPageUrl;
+    private double _currentCellSize = BaseCellSize;
+    private bool _isAttached;
+    private bool _isRefreshing;
+
+    private sealed record HotItemVisual(
+        Border Host,
+        Grid RowGrid,
+        TextBlock IndexTextBlock,
+        TextBlock TitleTextBlock);
+
+    public BilibiliHotSearchWidget()
+    {
+        InitializeComponent();
+
+        SearchEntryTextBlock.FontFamily = MiSansFontFamily;
+        TopRightTitleTextBlock.FontFamily = MiSansFontFamily;
+        HotItem1IndexTextBlock.FontFamily = MiSansFontFamily;
+        HotItem2IndexTextBlock.FontFamily = MiSansFontFamily;
+        HotItem3IndexTextBlock.FontFamily = MiSansFontFamily;
+        HotItem4IndexTextBlock.FontFamily = MiSansFontFamily;
+        HotItem1TextBlock.FontFamily = MiSansFontFamily;
+        HotItem2TextBlock.FontFamily = MiSansFontFamily;
+        HotItem3TextBlock.FontFamily = MiSansFontFamily;
+        HotItem4TextBlock.FontFamily = MiSansFontFamily;
+        StatusTextBlock.FontFamily = MiSansFontFamily;
+
+        _hotItemVisuals.Add(new HotItemVisual(HotItem1Host, HotItem1Grid, HotItem1IndexTextBlock, HotItem1TextBlock));
+        _hotItemVisuals.Add(new HotItemVisual(HotItem2Host, HotItem2Grid, HotItem2IndexTextBlock, HotItem2TextBlock));
+        _hotItemVisuals.Add(new HotItemVisual(HotItem3Host, HotItem3Grid, HotItem3IndexTextBlock, HotItem3TextBlock));
+        _hotItemVisuals.Add(new HotItemVisual(HotItem4Host, HotItem4Grid, HotItem4IndexTextBlock, HotItem4TextBlock));
+
+        _refreshTimer.Tick += OnRefreshTimerTick;
+        AttachedToVisualTree += OnAttachedToVisualTree;
+        DetachedFromVisualTree += OnDetachedFromVisualTree;
+        SizeChanged += OnSizeChanged;
+
+        ApplyCellSize(_currentCellSize);
+        UpdateLanguageCode();
+        ApplyLoadingState();
+    }
+
+    public void ApplyCellSize(double cellSize)
+    {
+        _currentCellSize = Math.Max(1, cellSize);
+        UpdateAdaptiveLayout();
+    }
+
+    public void SetRecommendationInfoService(IRecommendationInfoService recommendationInfoService)
+    {
+        _recommendationService = recommendationInfoService ?? DefaultRecommendationService;
+        if (_isAttached)
+        {
+            _ = RefreshHotSearchAsync(forceRefresh: false);
+        }
+    }
+
+    public void RefreshFromSettings()
+    {
+        _recommendationService.ClearCache();
+        if (_isAttached)
+        {
+            _ = RefreshHotSearchAsync(forceRefresh: true);
+        }
+    }
+
+    private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = true;
+        _refreshTimer.Start();
+        _ = RefreshHotSearchAsync(forceRefresh: false);
+    }
+
+    private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = false;
+        _refreshTimer.Stop();
+        CancelRefreshRequest();
+    }
+
+    private void OnSizeChanged(object? sender, SizeChangedEventArgs e)
+    {
+        ApplyCellSize(_currentCellSize);
+    }
+
+    private async void OnRefreshTimerTick(object? sender, EventArgs e)
+    {
+        await RefreshHotSearchAsync(forceRefresh: false);
+    }
+
+    private async Task RefreshHotSearchAsync(bool forceRefresh)
+    {
+        if (!_isAttached || _isRefreshing)
+        {
+            return;
+        }
+
+        _isRefreshing = true;
+        UpdateLanguageCode();
+
+        var cts = new CancellationTokenSource();
+        var previous = Interlocked.Exchange(ref _refreshCts, cts);
+        previous?.Cancel();
+        previous?.Dispose();
+
+        try
+        {
+            var query = new BilibiliHotSearchQuery(
+                Locale: _languageCode,
+                ItemCount: MaxDisplayItemCount,
+                ForceRefresh: forceRefresh);
+            var result = await _recommendationService.GetBilibiliHotSearchAsync(query, cts.Token);
+            if (!_isAttached || cts.IsCancellationRequested)
+            {
+                return;
+            }
+
+            if (!result.Success || result.Data is null)
+            {
+                ApplyFailedState();
+                return;
+            }
+
+            ApplySnapshot(result.Data);
+        }
+        catch (OperationCanceledException)
+        {
+            // Ignore canceled requests.
+        }
+        catch
+        {
+            if (_isAttached && !cts.IsCancellationRequested)
+            {
+                ApplyFailedState();
+            }
+        }
+        finally
+        {
+            if (ReferenceEquals(_refreshCts, cts))
+            {
+                _refreshCts = null;
+            }
+
+            cts.Dispose();
+            _isRefreshing = false;
+        }
+    }
+
+    private void ApplySnapshot(BilibiliHotSearchSnapshot snapshot)
+    {
+        SearchEntryTextBlock.Text = ResolveSearchEntryText(snapshot.SearchPlaceholder);
+        TopRightTitleTextBlock.Text = L("bilihot.widget.top_right_label", "bilibili热搜");
+
+        _searchPageUrl = NormalizeHttpUrl(snapshot.SearchUrl) ?? BuildDefaultSearchPageUrl();
+
+        _activeItems.Clear();
+        foreach (var item in snapshot.Items)
+        {
+            if (string.IsNullOrWhiteSpace(item.Title) || string.IsNullOrWhiteSpace(item.Url))
+            {
+                continue;
+            }
+
+            _activeItems.Add(item);
+            if (_activeItems.Count >= MaxDisplayItemCount)
+            {
+                break;
+            }
+        }
+
+        var fallbackText = L("bilihot.widget.fallback_item", "暂无热搜");
+        for (var i = 0; i < _hotItemVisuals.Count; i++)
+        {
+            var visual = _hotItemVisuals[i];
+            visual.Host.IsVisible = true;
+            visual.IndexTextBlock.Text = (i + 1).ToString();
+            visual.TitleTextBlock.Text = i < _activeItems.Count
+                ? NormalizeCompactText(_activeItems[i].Title)
+                : fallbackText;
+        }
+
+        StatusTextBlock.IsVisible = false;
+        UpdateInteractionState();
+        UpdateAdaptiveLayout();
+    }
+
+    private void ApplyLoadingState()
+    {
+        SearchEntryTextBlock.Text = L("bilihot.widget.search_entry", "搜索");
+        TopRightTitleTextBlock.Text = L("bilihot.widget.top_right_label", "bilibili热搜");
+        _searchPageUrl = BuildDefaultSearchPageUrl();
+        _activeItems.Clear();
+
+        var loadingText = L("bilihot.widget.loading_item", "加载中...");
+        for (var i = 0; i < _hotItemVisuals.Count; i++)
+        {
+            var visual = _hotItemVisuals[i];
+            visual.Host.IsVisible = true;
+            visual.IndexTextBlock.Text = (i + 1).ToString();
+            visual.TitleTextBlock.Text = loadingText;
+        }
+
+        StatusTextBlock.Text = L("bilihot.widget.loading", "加载中...");
+        StatusTextBlock.IsVisible = true;
+        UpdateInteractionState();
+        UpdateAdaptiveLayout();
+    }
+
+    private void ApplyFailedState()
+    {
+        SearchEntryTextBlock.Text = L("bilihot.widget.search_entry", "搜索");
+        TopRightTitleTextBlock.Text = L("bilihot.widget.top_right_label", "bilibili热搜");
+        _searchPageUrl = BuildDefaultSearchPageUrl();
+        _activeItems.Clear();
+
+        var fallbackText = L("bilihot.widget.fallback_item", "暂无热搜");
+        for (var i = 0; i < _hotItemVisuals.Count; i++)
+        {
+            var visual = _hotItemVisuals[i];
+            visual.Host.IsVisible = true;
+            visual.IndexTextBlock.Text = (i + 1).ToString();
+            visual.TitleTextBlock.Text = fallbackText;
+        }
+
+        StatusTextBlock.Text = L("bilihot.widget.fetch_failed", "热搜获取失败");
+        StatusTextBlock.IsVisible = true;
+        UpdateInteractionState();
+        UpdateAdaptiveLayout();
+    }
+
+    private string ResolveSearchEntryText(string? placeholder)
+    {
+        var compact = NormalizeCompactText(placeholder);
+        if (string.IsNullOrWhiteSpace(compact))
+        {
+            return L("bilihot.widget.search_entry", "搜索");
+        }
+
+        return compact;
+    }
+
+    private void OnSearchBoxPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        _ = sender;
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            return;
+        }
+
+        TryOpenUrl(_searchPageUrl);
+        e.Handled = true;
+    }
+
+    private void OnHotItemPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed ||
+            sender is not Border host ||
+            host.Tag is null ||
+            !int.TryParse(host.Tag.ToString(), out var index) ||
+            index < 0 ||
+            index >= _activeItems.Count)
+        {
+            return;
+        }
+
+        TryOpenUrl(_activeItems[index].Url);
+        e.Handled = true;
+    }
+
+    private void UpdateAdaptiveLayout()
+    {
+        var scale = ResolveScale();
+        var softScale = Math.Clamp(scale, 0.84, 1.26);
+        var totalWidth = Bounds.Width > 1 ? Bounds.Width : _currentCellSize * BaseWidthCells;
+        var totalHeight = Bounds.Height > 1 ? Bounds.Height : _currentCellSize * BaseHeightCells;
+
+        RootBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * softScale, 16, 52));
+        RootBorder.Padding = new Thickness(0);
+
+        var horizontalPadding = Math.Clamp(16 * softScale, 8, 24);
+        var verticalPadding = Math.Clamp(14 * softScale, 7, 20);
+        CardBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * softScale, 16, 52));
+        CardBorder.Padding = new Thickness(horizontalPadding, verticalPadding, horizontalPadding, verticalPadding);
+
+        var innerWidth = Math.Max(120, totalWidth - (horizontalPadding * 2d));
+        var innerHeight = Math.Max(72, totalHeight - (verticalPadding * 2d));
+        var rowSpacing = Math.Clamp(6 * softScale, 2, 9);
+        ContentGrid.RowSpacing = rowSpacing;
+        HeaderGrid.ColumnSpacing = Math.Clamp(10 * softScale, 6, 16);
+
+        var availableRowsHeight = Math.Max(40, innerHeight - rowSpacing * 4d);
+        var minTopRowHeight = Math.Clamp(20 * softScale, 18, 34);
+        var topRowHeight = Math.Clamp(availableRowsHeight * 0.27, minTopRowHeight, 52);
+        var lineRowHeight = Math.Max(10, (availableRowsHeight - topRowHeight) / 4d);
+        var minLineRowHeight = Math.Clamp(13 * softScale, 11, 24);
+        if (lineRowHeight < minLineRowHeight)
+        {
+            lineRowHeight = minLineRowHeight;
+            topRowHeight = Math.Max(minTopRowHeight, availableRowsHeight - lineRowHeight * 4d);
+            lineRowHeight = Math.Max(10, (availableRowsHeight - topRowHeight) / 4d);
+        }
+
+        if (ContentGrid.RowDefinitions.Count >= 5)
+        {
+            ContentGrid.RowDefinitions[0].Height = new GridLength(topRowHeight);
+            for (var i = 1; i <= 4; i++)
+            {
+                ContentGrid.RowDefinitions[i].Height = new GridLength(lineRowHeight);
+            }
+        }
+
+        var searchBoxHeight = Math.Clamp(topRowHeight * 0.84, 20, 46);
+        SearchBoxBorder.Height = searchBoxHeight;
+        SearchBoxBorder.Width = Math.Clamp(innerWidth * 0.30, 80, 180);
+        SearchBoxBorder.CornerRadius = new CornerRadius(searchBoxHeight / 2d);
+        SearchBoxBorder.Padding = new Thickness(
+            Math.Clamp(searchBoxHeight * 0.24, 5, 10),
+            0,
+            Math.Clamp(searchBoxHeight * 0.24, 5, 10),
+            0);
+        SearchGlyphIcon.FontSize = Math.Clamp(searchBoxHeight * 0.45, 10, 20);
+        SearchEntryTextBlock.FontSize = Math.Clamp(searchBoxHeight * 0.44, 10, 18);
+
+        TopRightTitleTextBlock.MaxWidth = Math.Max(80, innerWidth - SearchBoxBorder.Width - HeaderGrid.ColumnSpacing);
+        TopRightTitleTextBlock.FontSize = Math.Clamp(topRowHeight * 0.46, 11, 22);
+
+        var lineColumnGap = Math.Clamp(lineRowHeight * 0.34, 5, 12);
+        var indexWidth = Math.Clamp(lineRowHeight * 1.02, 16, 28);
+        var indexFont = Math.Clamp(lineRowHeight * 0.50, 10, 16);
+        var itemFont = Math.Clamp(lineRowHeight * 0.62, 12, 24);
+        var rowPadding = Math.Clamp(lineRowHeight * 0.08, 1, 4);
+        var itemTextWidth = Math.Max(56, innerWidth - indexWidth - lineColumnGap);
+
+        foreach (var visual in _hotItemVisuals)
+        {
+            visual.RowGrid.ColumnSpacing = lineColumnGap;
+            if (visual.RowGrid.ColumnDefinitions.Count > 0)
+            {
+                visual.RowGrid.ColumnDefinitions[0].Width = new GridLength(indexWidth, GridUnitType.Pixel);
+            }
+
+            visual.Host.Padding = new Thickness(0, rowPadding, 0, rowPadding);
+            visual.IndexTextBlock.FontSize = indexFont;
+            visual.IndexTextBlock.MaxWidth = indexWidth;
+            visual.IndexTextBlock.HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Right;
+            visual.IndexTextBlock.TextAlignment = TextAlignment.Right;
+            visual.TitleTextBlock.FontSize = itemFont;
+            visual.TitleTextBlock.MaxWidth = itemTextWidth;
+            visual.TitleTextBlock.TextAlignment = TextAlignment.Left;
+        }
+
+        StatusTextBlock.FontSize = Math.Clamp(itemFont, 10, 20);
+    }
+
+    private void UpdateInteractionState()
+    {
+        for (var i = 0; i < _hotItemVisuals.Count; i++)
+        {
+            var visual = _hotItemVisuals[i];
+            var enabled = i < _activeItems.Count && !string.IsNullOrWhiteSpace(_activeItems[i].Url);
+            visual.Host.IsHitTestVisible = enabled;
+            visual.Host.Opacity = enabled ? 1.0 : 0.68;
+            visual.Host.Cursor = enabled
+                ? new Cursor(StandardCursorType.Hand)
+                : new Cursor(StandardCursorType.Arrow);
+        }
+
+        var searchEnabled = !string.IsNullOrWhiteSpace(_searchPageUrl);
+        SearchBoxBorder.IsHitTestVisible = searchEnabled;
+        SearchBoxBorder.Opacity = searchEnabled ? 1.0 : 0.72;
+        SearchBoxBorder.Cursor = searchEnabled
+            ? new Cursor(StandardCursorType.Hand)
+            : new Cursor(StandardCursorType.Arrow);
+    }
+
+    private void UpdateLanguageCode()
+    {
+        try
+        {
+            var snapshot = _settingsService.Load();
+            _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+        }
+        catch
+        {
+            _languageCode = "zh-CN";
+        }
+    }
+
+    private static string NormalizeCompactText(string? text)
+    {
+        if (string.IsNullOrWhiteSpace(text))
+        {
+            return string.Empty;
+        }
+
+        return MultiWhitespaceRegex.Replace(text.Trim(), " ");
+    }
+
+    private static string BuildDefaultSearchPageUrl()
+    {
+        return "https://search.bilibili.com/all";
+    }
+
+    private static string? NormalizeHttpUrl(string? rawUrl)
+    {
+        if (string.IsNullOrWhiteSpace(rawUrl))
+        {
+            return null;
+        }
+
+        var candidate = rawUrl.Trim();
+        if (!Uri.TryCreate(candidate, UriKind.Absolute, out var uri))
+        {
+            return null;
+        }
+
+        if (!string.Equals(uri.Scheme, Uri.UriSchemeHttp, StringComparison.OrdinalIgnoreCase) &&
+            !string.Equals(uri.Scheme, Uri.UriSchemeHttps, StringComparison.OrdinalIgnoreCase))
+        {
+            return null;
+        }
+
+        return uri.ToString();
+    }
+
+    private void TryOpenUrl(string? rawUrl)
+    {
+        var normalizedUrl = NormalizeHttpUrl(rawUrl);
+        if (string.IsNullOrWhiteSpace(normalizedUrl))
+        {
+            return;
+        }
+
+        try
+        {
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = normalizedUrl,
+                UseShellExecute = true
+            };
+            Process.Start(startInfo);
+        }
+        catch
+        {
+            // Ignore malformed URLs or shell launch failures.
+        }
+    }
+
+    private double ResolveScale()
+    {
+        var expectedWidth = _currentCellSize * BaseWidthCells;
+        var expectedHeight = _currentCellSize * BaseHeightCells;
+        if (expectedWidth <= 0 || expectedHeight <= 0)
+        {
+            return 1d;
+        }
+
+        var actualWidth = Bounds.Width > 1 ? Bounds.Width : expectedWidth;
+        var actualHeight = Bounds.Height > 1 ? Bounds.Height : expectedHeight;
+        var scaleX = actualWidth / expectedWidth;
+        var scaleY = actualHeight / expectedHeight;
+        return Math.Clamp(Math.Min(scaleX, scaleY), 0.72, 2.8);
+    }
+
+    private string L(string key, string fallback)
+    {
+        return _localizationService.GetString(_languageCode, key, fallback);
+    }
+
+    private void CancelRefreshRequest()
+    {
+        var cts = Interlocked.Exchange(ref _refreshCts, null);
+        if (cts is null)
+        {
+            return;
+        }
+
+        cts.Cancel();
+        cts.Dispose();
+    }
+}

LanMountainDesktop/Views/Components/CnrDailyNewsSettingsWindow.axaml

@@ -0,0 +1,87 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d"
+             d:DesignWidth="420"
+             d:DesignHeight="300"
+             x:Class="LanMountainDesktop.Views.Components.CnrDailyNewsSettingsWindow">
+    <Border Background="{DynamicResource AdaptiveBackgroundBrush}"
+            Padding="16">
+        <Grid RowDefinitions="Auto,Auto,*"
+              RowSpacing="10">
+            <TextBlock x:Name="TitleTextBlock"
+                       Text="CNR news settings"
+                       FontSize="18"
+                       FontWeight="SemiBold"
+                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+
+            <TextBlock x:Name="DescriptionTextBlock"
+                       Grid.Row="1"
+                       Text="Configure auto-rotation and refresh interval."
+                       FontSize="12"
+                       TextWrapping="Wrap"
+                       Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+
+            <ScrollViewer Grid.Row="2"
+                          HorizontalScrollBarVisibility="Disabled"
+                          VerticalScrollBarVisibility="Auto">
+                <StackPanel Spacing="10"
+                            Margin="0,0,6,0">
+                    <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}"
+                            BorderBrush="{DynamicResource AdaptiveButtonBorderBrush}"
+                            BorderThickness="1"
+                            CornerRadius="12"
+                            Padding="12">
+                        <StackPanel Spacing="6">
+                            <TextBlock x:Name="AutoRotateLabelTextBlock"
+                                       Text="Auto-rotation"
+                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                            <CheckBox x:Name="AutoRotateCheckBox"
+                                      Content="Enable auto-rotation"
+                                      Checked="OnAutoRotateChanged"
+                                      Unchecked="OnAutoRotateChanged" />
+                        </StackPanel>
+                    </Border>
+
+                    <Border x:Name="FrequencyCardBorder"
+                            Background="{DynamicResource AdaptiveSurfaceRaisedBrush}"
+                            BorderBrush="{DynamicResource AdaptiveButtonBorderBrush}"
+                            BorderThickness="1"
+                            CornerRadius="12"
+                            Padding="12"
+                            IsVisible="False">
+                        <StackPanel Spacing="6">
+                            <TextBlock x:Name="FrequencyLabelTextBlock"
+                                       Text="Rotation interval"
+                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                            <ComboBox x:Name="FrequencyComboBox"
+                                      HorizontalAlignment="Stretch"
+                                      MinWidth="0"
+                                      SelectionChanged="OnFrequencySelectionChanged">
+                                <ComboBoxItem x:Name="Frequency5mItem"
+                                              Tag="5"
+                                              Content="5 min" />
+                                <ComboBoxItem x:Name="Frequency10mItem"
+                                              Tag="10"
+                                              Content="10 min" />
+                                <ComboBoxItem x:Name="Frequency40mItem"
+                                              Tag="40"
+                                              Content="40 min" />
+                                <ComboBoxItem x:Name="Frequency1hItem"
+                                              Tag="60"
+                                              Content="1 hour" />
+                                <ComboBoxItem x:Name="Frequency12hItem"
+                                              Tag="720"
+                                              Content="12 hours" />
+                                <ComboBoxItem x:Name="Frequency24hItem"
+                                              Tag="1440"
+                                              Content="24 hours" />
+                            </ComboBox>
+                        </StackPanel>
+                    </Border>
+                </StackPanel>
+            </ScrollViewer>
+        </Grid>
+    </Border>
+</UserControl>

LanMountainDesktop/Views/Components/CnrDailyNewsSettingsWindow.axaml.cs

@@ -0,0 +1,137 @@
+using System;
+using System.Linq;
+using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
+using Avalonia.Interactivity;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+public partial class CnrDailyNewsSettingsWindow : UserControl
+{
+    private static readonly int[] SupportedIntervals = [5, 10, 40, 60, 720, 1440];
+
+    private readonly AppSettingsService _appSettingsService = new();
+    private readonly LocalizationService _localizationService = new();
+    private bool _suppressEvents;
+    private string _languageCode = "zh-CN";
+
+    public event EventHandler? SettingsChanged;
+
+    public CnrDailyNewsSettingsWindow()
+    {
+        InitializeComponent();
+        LoadState();
+        ApplyLocalization();
+    }
+
+    private void LoadState()
+    {
+        var snapshot = _appSettingsService.Load();
+        _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+
+        var enabled = snapshot.CnrDailyNewsAutoRotateEnabled;
+        var interval = NormalizeInterval(snapshot.CnrDailyNewsAutoRotateIntervalMinutes);
+
+        _suppressEvents = true;
+        AutoRotateCheckBox.IsChecked = enabled;
+        SelectInterval(interval);
+        FrequencyCardBorder.IsVisible = enabled;
+        _suppressEvents = false;
+    }
+
+    private void ApplyLocalization()
+    {
+        TitleTextBlock.Text = L("cnrnews.settings.title", "CNR news settings");
+        DescriptionTextBlock.Text = L("cnrnews.settings.desc", "Configure auto-rotation and refresh interval.");
+        AutoRotateLabelTextBlock.Text = L("cnrnews.settings.auto_rotate_label", "Auto-rotation");
+        AutoRotateCheckBox.Content = L("cnrnews.settings.auto_rotate_enabled", "Enable auto-rotation");
+        FrequencyLabelTextBlock.Text = L("cnrnews.settings.frequency_label", "Rotation interval");
+        Frequency5mItem.Content = L("cnrnews.settings.frequency_5m", "5 min");
+        Frequency10mItem.Content = L("cnrnews.settings.frequency_10m", "10 min");
+        Frequency40mItem.Content = L("cnrnews.settings.frequency_40m", "40 min");
+        Frequency1hItem.Content = L("cnrnews.settings.frequency_1h", "1 hour");
+        Frequency12hItem.Content = L("cnrnews.settings.frequency_12h", "12 hours");
+        Frequency24hItem.Content = L("cnrnews.settings.frequency_24h", "24 hours");
+    }
+
+    private void OnAutoRotateChanged(object? sender, RoutedEventArgs e)
+    {
+        _ = sender;
+        _ = e;
+        if (_suppressEvents)
+        {
+            return;
+        }
+
+        var enabled = AutoRotateCheckBox.IsChecked == true;
+        FrequencyCardBorder.IsVisible = enabled;
+        SaveState();
+    }
+
+    private void OnFrequencySelectionChanged(object? sender, SelectionChangedEventArgs e)
+    {
+        _ = sender;
+        _ = e;
+        if (_suppressEvents)
+        {
+            return;
+        }
+
+        SaveState();
+    }
+
+    private void SaveState()
+    {
+        var snapshot = _appSettingsService.Load();
+        snapshot.CnrDailyNewsAutoRotateEnabled = AutoRotateCheckBox.IsChecked == true;
+        snapshot.CnrDailyNewsAutoRotateIntervalMinutes = GetSelectedInterval();
+        _appSettingsService.Save(snapshot);
+        SettingsChanged?.Invoke(this, EventArgs.Empty);
+    }
+
+    private int GetSelectedInterval()
+    {
+        if (FrequencyComboBox.SelectedItem is ComboBoxItem item &&
+            item.Tag is string tagText &&
+            int.TryParse(tagText, out var minutes))
+        {
+            return NormalizeInterval(minutes);
+        }
+
+        return 60;
+    }
+
+    private void SelectInterval(int intervalMinutes)
+    {
+        var selected = FrequencyComboBox.Items
+            .OfType<ComboBoxItem>()
+            .FirstOrDefault(item =>
+                item.Tag is string tagText &&
+                int.TryParse(tagText, out var minutes) &&
+                minutes == intervalMinutes);
+        FrequencyComboBox.SelectedItem = selected ?? FrequencyComboBox.Items.OfType<ComboBoxItem>().FirstOrDefault();
+    }
+
+    private static int NormalizeInterval(int minutes)
+    {
+        if (minutes <= 0)
+        {
+            return 60;
+        }
+
+        if (SupportedIntervals.Contains(minutes))
+        {
+            return minutes;
+        }
+
+        return SupportedIntervals
+            .OrderBy(value => Math.Abs(value - minutes))
+            .FirstOrDefault(60);
+    }
+
+    private string L(string key, string fallback)
+    {
+        return _localizationService.GetString(_languageCode, key, fallback);
+    }
+}

LanMountainDesktop/Views/Components/CnrDailyNewsWidget.axaml

@@ -0,0 +1,148 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:fi="using:FluentIcons.Avalonia"
+             mc:Ignorable="d"
+             d:DesignWidth="640"
+             d:DesignHeight="320"
+             x:Class="LanMountainDesktop.Views.Components.CnrDailyNewsWidget">
+
+    <Border x:Name="RootBorder"
+            CornerRadius="34"
+            Background="Transparent"
+            ClipToBounds="True"
+            BorderThickness="0"
+            Padding="0">
+        <Grid>
+            <Border x:Name="CardBorder"
+                    Background="#FCFCFD"
+                    CornerRadius="34"
+                    BorderBrush="Transparent"
+                    BorderThickness="0"
+                    Padding="16,14,16,14">
+                <Grid RowDefinitions="Auto,Auto,Auto,Auto"
+                      RowSpacing="8">
+                    <Grid Grid.Row="0"
+                          ColumnDefinitions="*,Auto"
+                          ColumnSpacing="10">
+                        <StackPanel Orientation="Horizontal"
+                                    Spacing="0"
+                                    VerticalAlignment="Center">
+                            <TextBlock x:Name="BrandPrimaryTextBlock"
+                                       Text="&#22830;&#24191;&#32593;"
+                                       Foreground="#D6272E"
+                                       FontSize="28"
+                                       FontWeight="Bold"
+                                       TextTrimming="CharacterEllipsis" />
+                            <TextBlock x:Name="BrandSecondaryTextBlock"
+                                       Text="&#183;&#22836;&#26465;"
+                                       Foreground="#202327"
+                                       FontSize="28"
+                                       FontWeight="Bold"
+                                       TextTrimming="CharacterEllipsis" />
+                        </StackPanel>
+
+                        <Button x:Name="RefreshButton"
+                                Grid.Column="1"
+                                Width="116"
+                                Height="42"
+                                CornerRadius="21"
+                                Background="#F0F0F0"
+                                BorderBrush="Transparent"
+                                BorderThickness="0"
+                                Padding="10,0"
+                                Focusable="False">
+                            <StackPanel Orientation="Horizontal"
+                                        Spacing="4"
+                                        HorizontalAlignment="Center"
+                                        VerticalAlignment="Center">
+                                <fi:SymbolIcon x:Name="RefreshGlyphIcon"
+                                               Symbol="ArrowClockwise"
+                                               IconVariant="Regular"
+                                               Foreground="#52575F"
+                                               FontSize="19"
+                                               VerticalAlignment="Center" />
+                                <TextBlock x:Name="RefreshLabelTextBlock"
+                                           Text="&#25442;&#19968;&#25442;"
+                                           Foreground="#202327"
+                                           FontSize="25"
+                                           FontWeight="SemiBold"
+                                           VerticalAlignment="Center" />
+                            </StackPanel>
+                        </Button>
+                    </Grid>
+
+                    <Grid x:Name="NewsItem1Grid"
+                          Grid.Row="1"
+                          ColumnDefinitions="*,Auto"
+                          ColumnSpacing="12"
+                          PointerPressed="OnNewsItem1PointerPressed">
+                        <TextBlock x:Name="News1TitleTextBlock"
+                                   Text="Headline"
+                                   Foreground="#202327"
+                                   FontSize="21"
+                                   FontWeight="SemiBold"
+                                   TextWrapping="Wrap"
+                                   TextTrimming="CharacterEllipsis"
+                                   MaxLines="2"
+                                   VerticalAlignment="Top"
+                                   LineHeight="24" />
+
+                        <Border x:Name="News1ImageHost"
+                                Grid.Column="1"
+                                Width="160"
+                                Height="90"
+                                CornerRadius="16"
+                                ClipToBounds="True"
+                                Background="#E6E6E6">
+                            <Image x:Name="News1Image"
+                                   Stretch="UniformToFill" />
+                        </Border>
+                    </Grid>
+
+                    <Grid x:Name="NewsItem2Grid"
+                          Grid.Row="2"
+                          ColumnDefinitions="*,Auto"
+                          ColumnSpacing="12"
+                          PointerPressed="OnNewsItem2PointerPressed">
+                        <TextBlock x:Name="News2TitleTextBlock"
+                                   Text="Headline"
+                                   Foreground="#202327"
+                                   FontSize="21"
+                                   FontWeight="SemiBold"
+                                   TextWrapping="Wrap"
+                                   TextTrimming="CharacterEllipsis"
+                                   MaxLines="2"
+                                   VerticalAlignment="Top"
+                                   LineHeight="24" />
+
+                        <Border x:Name="News2ImageHost"
+                                Grid.Column="1"
+                                Width="160"
+                                Height="90"
+                                CornerRadius="16"
+                                ClipToBounds="True"
+                                Background="#E6E6E6">
+                            <Image x:Name="News2Image"
+                                   Stretch="UniformToFill" />
+                        </Border>
+                    </Grid>
+
+                    <StackPanel x:Name="ExtraNewsItemsPanel"
+                                Grid.Row="3"
+                                Spacing="6"
+                                IsVisible="False" />
+                </Grid>
+            </Border>
+
+            <TextBlock x:Name="StatusTextBlock"
+                       IsVisible="False"
+                       Text="Loading"
+                       Foreground="#6A6F77"
+                       FontSize="16"
+                       HorizontalAlignment="Center"
+                       VerticalAlignment="Center" />
+        </Grid>
+    </Border>
+</UserControl>

LanMountainDesktop/Views/Components/CnrDailyNewsWidget.axaml.cs

@@ -0,0 +1,810 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Net.Http;
+using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Documents;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+using Avalonia.Media;
+using Avalonia.Media.Imaging;
+using Avalonia.Threading;
+using LanMountainDesktop.Models;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+public partial class CnrDailyNewsWidget : UserControl, IDesktopComponentWidget, IRecommendationInfoAwareComponentWidget
+{
+    private static readonly Regex MultiWhitespaceRegex = new(@"\s+", RegexOptions.Compiled);
+    private static readonly FontFamily MiSansFontFamily = new("MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans");
+    private static readonly IRecommendationInfoService DefaultRecommendationService = new RecommendationDataService();
+    private static readonly HttpClient ImageHttpClient = new()
+    {
+        Timeout = TimeSpan.FromSeconds(8)
+    };
+
+    private const string BrowserUserAgent =
+        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0 Safari/537.36";
+
+    private const double BaseCellSize = 48d;
+    private const int BaseWidthCells = 4;
+    private const int BaseHeightCells = 2;
+    private static readonly int[] SupportedAutoRotateIntervalsMinutes = [5, 10, 40, 60, 720, 1440];
+
+    private readonly DispatcherTimer _refreshTimer = new()
+    {
+        Interval = TimeSpan.FromMinutes(30)
+    };
+
+    private readonly AppSettingsService _settingsService = new();
+    private readonly LocalizationService _localizationService = new();
+    private readonly Bitmap?[] _newsBitmaps = new Bitmap?[2];
+    private readonly List<string?> _newsUrls = [];
+    private readonly List<ExtraNewsRowVisual> _extraNewsRows = [];
+    private IReadOnlyList<DailyNewsItemSnapshot> _activeNewsItems = [];
+    private int _renderedNewsCount = 2;
+
+    private sealed class ExtraNewsRowVisual
+    {
+        public ExtraNewsRowVisual(
+            Grid rootGrid,
+            TextBlock titleTextBlock,
+            Border imageHost,
+            Image imageControl,
+            int newsIndex)
+        {
+            RootGrid = rootGrid;
+            TitleTextBlock = titleTextBlock;
+            ImageHost = imageHost;
+            ImageControl = imageControl;
+            NewsIndex = newsIndex;
+        }
+
+        public Grid RootGrid { get; }
+
+        public TextBlock TitleTextBlock { get; }
+
+        public Border ImageHost { get; }
+
+        public Image ImageControl { get; }
+
+        public int NewsIndex { get; }
+
+        public Bitmap? Bitmap { get; set; }
+    }
+
+    private IRecommendationInfoService _recommendationService = DefaultRecommendationService;
+    private CancellationTokenSource? _refreshCts;
+    private string _languageCode = "zh-CN";
+    private double _currentCellSize = BaseCellSize;
+    private bool _isAttached;
+    private bool _isRefreshing;
+    private bool _autoRotateEnabled = true;
+
+    public CnrDailyNewsWidget()
+    {
+        InitializeComponent();
+
+        BrandPrimaryTextBlock.FontFamily = MiSansFontFamily;
+        BrandSecondaryTextBlock.FontFamily = MiSansFontFamily;
+        RefreshLabelTextBlock.FontFamily = MiSansFontFamily;
+        News1TitleTextBlock.FontFamily = MiSansFontFamily;
+        News2TitleTextBlock.FontFamily = MiSansFontFamily;
+        StatusTextBlock.FontFamily = MiSansFontFamily;
+
+        _refreshTimer.Tick += OnRefreshTimerTick;
+        RefreshButton.Click += OnRefreshButtonClick;
+        AttachedToVisualTree += OnAttachedToVisualTree;
+        DetachedFromVisualTree += OnDetachedFromVisualTree;
+        SizeChanged += OnSizeChanged;
+
+        ApplyCellSize(_currentCellSize);
+        UpdateLanguageCode();
+        ApplyAutoRotateSettings();
+        ApplyLoadingState();
+        UpdateRefreshButtonState();
+    }
+
+    public void ApplyCellSize(double cellSize)
+    {
+        _currentCellSize = Math.Max(1, cellSize);
+        UpdateAdaptiveLayout();
+    }
+
+    public void SetRecommendationInfoService(IRecommendationInfoService recommendationInfoService)
+    {
+        _recommendationService = recommendationInfoService ?? DefaultRecommendationService;
+        if (_isAttached)
+        {
+            _ = RefreshNewsAsync(forceRefresh: false);
+        }
+    }
+
+    public void RefreshFromSettings()
+    {
+        _recommendationService.ClearCache();
+        ApplyAutoRotateSettings();
+        if (_isAttached)
+        {
+            _ = RefreshNewsAsync(forceRefresh: true);
+        }
+    }
+
+    private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = true;
+        ApplyAutoRotateSettings();
+        UpdateRefreshButtonState();
+        _ = RefreshNewsAsync(forceRefresh: false);
+    }
+
+    private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = false;
+        _refreshTimer.Stop();
+        CancelRefreshRequest();
+        DisposeNewsBitmaps();
+        ClearExtraNewsRows();
+        UpdateRefreshButtonState();
+    }
+
+    private void OnSizeChanged(object? sender, SizeChangedEventArgs e)
+    {
+        ApplyCellSize(_currentCellSize);
+    }
+
+    private async void OnRefreshButtonClick(object? sender, RoutedEventArgs e)
+    {
+        if (_isRefreshing)
+        {
+            return;
+        }
+
+        await RefreshNewsAsync(forceRefresh: true);
+        e.Handled = true;
+    }
+
+    private async void OnRefreshTimerTick(object? sender, EventArgs e)
+    {
+        await RefreshNewsAsync(forceRefresh: true);
+    }
+
+    private void OnNewsItem1PointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            return;
+        }
+
+        TryOpenNewsUrl(0);
+        e.Handled = true;
+    }
+
+    private void OnNewsItem2PointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            return;
+        }
+
+        TryOpenNewsUrl(1);
+        e.Handled = true;
+    }
+
+    private void OnExtraNewsItemPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed ||
+            sender is not Control control ||
+            control.Tag is not int index)
+        {
+            return;
+        }
+
+        TryOpenNewsUrl(index);
+        e.Handled = true;
+    }
+
+    private async Task RefreshNewsAsync(bool forceRefresh)
+    {
+        if (!_isAttached || _isRefreshing)
+        {
+            return;
+        }
+
+        _isRefreshing = true;
+        UpdateRefreshButtonState();
+        UpdateLanguageCode();
+
+        var cts = new CancellationTokenSource();
+        var previous = Interlocked.Exchange(ref _refreshCts, cts);
+        previous?.Cancel();
+        previous?.Dispose();
+
+        try
+        {
+            var query = new DailyNewsQuery(
+                Locale: _languageCode,
+                ItemCount: ResolveDesiredNewsItemCount(),
+                ForceRefresh: forceRefresh);
+            var result = await _recommendationService.GetDailyNewsAsync(query, cts.Token);
+            if (!_isAttached || cts.IsCancellationRequested)
+            {
+                return;
+            }
+
+            if (!result.Success || result.Data is null)
+            {
+                ApplyFailedState();
+                return;
+            }
+
+            await ApplySnapshotAsync(result.Data, cts.Token);
+        }
+        catch (OperationCanceledException)
+        {
+            // Ignore canceled requests.
+        }
+        catch
+        {
+            if (_isAttached && !cts.IsCancellationRequested)
+            {
+                ApplyFailedState();
+            }
+        }
+        finally
+        {
+            if (ReferenceEquals(_refreshCts, cts))
+            {
+                _refreshCts = null;
+            }
+
+            cts.Dispose();
+            _isRefreshing = false;
+            UpdateRefreshButtonState();
+        }
+    }
+
+    private async Task ApplySnapshotAsync(DailyNewsSnapshot snapshot, CancellationToken cancellationToken)
+    {
+        var items = snapshot.Items is null
+            ? []
+            : snapshot.Items.Take(2).ToArray();
+        _activeNewsItems = items;
+
+        var item1 = items.Length > 0 ? items[0] : null;
+        var item2 = items.Length > 1 ? items[1] : null;
+
+        UpdateHotHeadlineText(item1?.Title);
+        News2TitleTextBlock.Text = NormalizeCompactText(item2?.Title);
+
+        _newsUrls.Clear();
+        foreach (var item in items)
+        {
+            _newsUrls.Add(NormalizeHttpUrl(item.Url));
+        }
+
+        RenderExtraNewsRows([]);
+        UpdateNewsInteractionState();
+
+        StatusTextBlock.IsVisible = false;
+        UpdateAdaptiveLayout();
+
+        var loadTasks = new[]
+        {
+            TryDownloadBitmapAsync(item1?.ImageUrl, cancellationToken),
+            TryDownloadBitmapAsync(item2?.ImageUrl, cancellationToken)
+        };
+        var bitmaps = await Task.WhenAll(loadTasks);
+        if (cancellationToken.IsCancellationRequested || !_isAttached)
+        {
+            bitmaps[0]?.Dispose();
+            bitmaps[1]?.Dispose();
+            return;
+        }
+
+        SetNewsBitmap(0, bitmaps[0]);
+        SetNewsBitmap(1, bitmaps[1]);
+    }
+
+    private void ApplyLoadingState()
+    {
+        _activeNewsItems = [];
+        _newsUrls.Clear();
+        UpdateHotHeadlineText(L("cnrnews.widget.loading_title", "Loading headlines"));
+        News2TitleTextBlock.Text = L("cnrnews.widget.loading_subtitle", "Please wait");
+        StatusTextBlock.Text = L("cnrnews.widget.loading", "Loading...");
+        StatusTextBlock.IsVisible = true;
+        SetNewsBitmap(0, null);
+        SetNewsBitmap(1, null);
+        RenderExtraNewsRows([]);
+        UpdateNewsInteractionState();
+        UpdateAdaptiveLayout();
+    }
+
+    private void ApplyFailedState()
+    {
+        _activeNewsItems = [];
+        _newsUrls.Clear();
+        News1TitleTextBlock.Inlines = null;
+        News1TitleTextBlock.Text = L("cnrnews.widget.fallback_title", "CNR news is temporarily unavailable");
+        News2TitleTextBlock.Text = L("cnrnews.widget.fallback_subtitle", "Tap refresh and try again");
+        StatusTextBlock.Text = L("cnrnews.widget.fetch_failed", "News fetch failed");
+        StatusTextBlock.IsVisible = true;
+        SetNewsBitmap(0, null);
+        SetNewsBitmap(1, null);
+        RenderExtraNewsRows([]);
+        UpdateNewsInteractionState();
+        UpdateAdaptiveLayout();
+    }
+
+    private int ResolveDesiredNewsItemCount()
+    {
+        return 2;
+    }
+
+    private void UpdateHotHeadlineText(string? title)
+    {
+        var normalizedTitle = NormalizeCompactText(title);
+        var hotLabel = L("cnrnews.widget.hot_label", "Hot");
+        if (News1TitleTextBlock.Inlines is null)
+        {
+            News1TitleTextBlock.Text = $"{hotLabel} | {normalizedTitle}";
+            return;
+        }
+
+        News1TitleTextBlock.Inlines.Clear();
+        News1TitleTextBlock.Inlines.Add(new Run($"{hotLabel} | ")
+        {
+            Foreground = new SolidColorBrush(Color.Parse("#D6272E")),
+            FontWeight = FontWeight.SemiBold
+        });
+        News1TitleTextBlock.Inlines.Add(new Run(normalizedTitle)
+        {
+            Foreground = new SolidColorBrush(Color.Parse("#202327")),
+            FontWeight = FontWeight.SemiBold
+        });
+    }
+
+    private void RenderExtraNewsRows(IReadOnlyList<DailyNewsItemSnapshot> extraItems)
+    {
+        ClearExtraNewsRows();
+        if (extraItems.Count == 0)
+        {
+            ExtraNewsItemsPanel.IsVisible = false;
+            _renderedNewsCount = 2;
+            return;
+        }
+
+        for (var i = 0; i < extraItems.Count; i++)
+        {
+            var item = extraItems[i];
+            var itemIndex = i + 2;
+            var rowGrid = new Grid
+            {
+                ColumnSpacing = 12,
+                Tag = itemIndex,
+                Cursor = new Cursor(StandardCursorType.Hand),
+                IsHitTestVisible = true
+            };
+            rowGrid.ColumnDefinitions.Add(new ColumnDefinition(new GridLength(1, GridUnitType.Star)));
+            rowGrid.ColumnDefinitions.Add(new ColumnDefinition(GridLength.Auto));
+            rowGrid.PointerPressed += OnExtraNewsItemPointerPressed;
+
+            var textBlock = new TextBlock
+            {
+                Text = NormalizeCompactText(item.Title),
+                Foreground = new SolidColorBrush(Color.Parse("#202327")),
+                FontFamily = MiSansFontFamily,
+                FontWeight = FontWeight.SemiBold,
+                TextWrapping = TextWrapping.Wrap,
+                TextTrimming = TextTrimming.CharacterEllipsis,
+                MaxLines = 2,
+                VerticalAlignment = Avalonia.Layout.VerticalAlignment.Top,
+                IsHitTestVisible = false
+            };
+
+            var imageHost = new Border
+            {
+                Width = 160,
+                Height = 90,
+                CornerRadius = new CornerRadius(16),
+                ClipToBounds = true,
+                Background = new SolidColorBrush(Color.Parse("#E6E6E6")),
+                IsHitTestVisible = false
+            };
+            var image = new Image
+            {
+                Stretch = Stretch.UniformToFill,
+                IsHitTestVisible = false
+            };
+            imageHost.Child = image;
+            Grid.SetColumn(imageHost, 1);
+
+            rowGrid.Children.Add(textBlock);
+            rowGrid.Children.Add(imageHost);
+            ExtraNewsItemsPanel.Children.Add(rowGrid);
+            _extraNewsRows.Add(new ExtraNewsRowVisual(rowGrid, textBlock, imageHost, image, itemIndex));
+        }
+
+        ExtraNewsItemsPanel.IsVisible = true;
+        _renderedNewsCount = 2 + extraItems.Count;
+    }
+
+    private void ClearExtraNewsRows()
+    {
+        foreach (var row in _extraNewsRows)
+        {
+            row.RootGrid.PointerPressed -= OnExtraNewsItemPointerPressed;
+            if (ReferenceEquals(row.ImageControl.Source, row.Bitmap))
+            {
+                row.ImageControl.Source = null;
+            }
+
+            row.Bitmap?.Dispose();
+            row.Bitmap = null;
+        }
+
+        _extraNewsRows.Clear();
+        ExtraNewsItemsPanel.Children.Clear();
+    }
+
+    private void SetExtraNewsBitmap(int rowIndex, Bitmap? bitmap)
+    {
+        if (rowIndex < 0 || rowIndex >= _extraNewsRows.Count)
+        {
+            bitmap?.Dispose();
+            return;
+        }
+
+        var row = _extraNewsRows[rowIndex];
+        if (ReferenceEquals(row.ImageControl.Source, row.Bitmap))
+        {
+            row.ImageControl.Source = null;
+        }
+
+        row.Bitmap?.Dispose();
+        row.Bitmap = bitmap;
+        row.ImageControl.Source = bitmap;
+    }
+
+    private void UpdateAdaptiveLayout()
+    {
+        var scale = ResolveScale();
+        var totalWidth = Bounds.Width > 1 ? Bounds.Width : _currentCellSize * BaseWidthCells;
+
+        RootBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * scale, 16, 52));
+        RootBorder.Padding = new Thickness(0);
+
+        CardBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * scale, 16, 52));
+        CardBorder.Padding = new Thickness(
+            Math.Clamp(16 * scale, 8, 24),
+            Math.Clamp(14 * scale, 7, 22),
+            Math.Clamp(16 * scale, 8, 24),
+            Math.Clamp(14 * scale, 7, 22));
+
+        var headlineFont = Math.Clamp(24 * scale, 12, 34);
+        BrandPrimaryTextBlock.FontSize = headlineFont;
+        BrandSecondaryTextBlock.FontSize = headlineFont;
+
+        var refreshHeight = Math.Clamp(42 * scale, 24, 52);
+        var refreshWidth = Math.Clamp(116 * scale, 76, 152);
+        RefreshButton.Height = refreshHeight;
+        RefreshButton.Width = refreshWidth;
+        RefreshButton.CornerRadius = new CornerRadius(refreshHeight / 2d);
+        RefreshGlyphIcon.FontSize = Math.Clamp(19 * scale, 11, 24);
+        RefreshLabelTextBlock.FontSize = Math.Clamp(22 * scale, 11, 29);
+
+        var imageWidth = Math.Clamp(totalWidth * 0.20, 60, 170);
+        var imageHeight = Math.Clamp(imageWidth * 0.56, 38, 94);
+        News1ImageHost.Width = imageWidth;
+        News1ImageHost.Height = imageHeight;
+        News2ImageHost.Width = imageWidth;
+        News2ImageHost.Height = imageHeight;
+        News1ImageHost.CornerRadius = new CornerRadius(Math.Clamp(16 * scale, 8, 22));
+        News2ImageHost.CornerRadius = new CornerRadius(Math.Clamp(16 * scale, 8, 22));
+
+        var columnGap = Math.Clamp(12 * scale, 6, 18);
+        NewsItem1Grid.ColumnSpacing = columnGap;
+        NewsItem2Grid.ColumnSpacing = columnGap;
+        NewsItem1Grid.ColumnDefinitions[1].Width = new GridLength(imageWidth);
+        NewsItem2Grid.ColumnDefinitions[1].Width = new GridLength(imageWidth);
+
+        var availableTextWidth = Math.Max(
+            84,
+            totalWidth - imageWidth - columnGap - Math.Clamp(20 * scale, 10, 32));
+        News1TitleTextBlock.MaxWidth = availableTextWidth;
+        News2TitleTextBlock.MaxWidth = availableTextWidth;
+
+        var newsFont = Math.Clamp(21 * scale, 10.5, 28);
+        News1TitleTextBlock.FontSize = newsFont;
+        News2TitleTextBlock.FontSize = newsFont;
+        var mainNewsLineHeight = newsFont * 1.14;
+        News1TitleTextBlock.LineHeight = mainNewsLineHeight;
+        News2TitleTextBlock.LineHeight = mainNewsLineHeight;
+        var mainNewsMinHeight = mainNewsLineHeight * 2;
+        News1TitleTextBlock.MinHeight = mainNewsMinHeight;
+        News2TitleTextBlock.MinHeight = mainNewsMinHeight;
+        StatusTextBlock.FontSize = Math.Clamp(16 * scale, 9, 24);
+        News1TitleTextBlock.MaxLines = 2;
+        News2TitleTextBlock.MaxLines = 2;
+
+        foreach (var row in _extraNewsRows)
+        {
+            row.RootGrid.ColumnSpacing = columnGap;
+            if (row.RootGrid.ColumnDefinitions.Count > 1)
+            {
+                row.RootGrid.ColumnDefinitions[1].Width = new GridLength(imageWidth);
+            }
+
+            row.ImageHost.Width = imageWidth;
+            row.ImageHost.Height = imageHeight;
+            row.ImageHost.CornerRadius = new CornerRadius(Math.Clamp(16 * scale, 8, 22));
+
+            row.TitleTextBlock.MaxWidth = availableTextWidth;
+            row.TitleTextBlock.FontSize = Math.Clamp(19 * scale, 10, 25);
+            row.TitleTextBlock.LineHeight = row.TitleTextBlock.FontSize * 1.12;
+            row.TitleTextBlock.MinHeight = row.TitleTextBlock.LineHeight * 2;
+            row.TitleTextBlock.MaxLines = 2;
+        }
+
+        ExtraNewsItemsPanel.Spacing = Math.Clamp(6 * scale, 3, 10);
+    }
+
+    private void UpdateRefreshButtonState()
+    {
+        RefreshButton.IsEnabled = !_isRefreshing;
+        RefreshButton.Opacity = _isAttached ? 1.0 : 0.85;
+        RefreshGlyphIcon.Opacity = _isRefreshing ? 0.56 : 1.0;
+        RefreshLabelTextBlock.Opacity = _isRefreshing ? 0.56 : 1.0;
+    }
+
+    private void UpdateNewsInteractionState()
+    {
+        var item1Enabled = _newsUrls.Count > 0 && !string.IsNullOrWhiteSpace(_newsUrls[0]);
+        var item2Enabled = _newsUrls.Count > 1 && !string.IsNullOrWhiteSpace(_newsUrls[1]);
+
+        NewsItem1Grid.IsHitTestVisible = item1Enabled;
+        NewsItem2Grid.IsHitTestVisible = item2Enabled;
+        NewsItem1Grid.Opacity = item1Enabled ? 1.0 : 0.72;
+        NewsItem2Grid.Opacity = item2Enabled ? 1.0 : 0.72;
+
+        foreach (var row in _extraNewsRows)
+        {
+            var index = row.NewsIndex;
+            var enabled = index >= 0 && index < _newsUrls.Count && !string.IsNullOrWhiteSpace(_newsUrls[index]);
+            row.RootGrid.IsHitTestVisible = enabled;
+            row.RootGrid.Opacity = enabled ? 1.0 : 0.72;
+            row.RootGrid.Cursor = enabled
+                ? new Cursor(StandardCursorType.Hand)
+                : new Cursor(StandardCursorType.Arrow);
+        }
+    }
+
+    private static async Task<Bitmap?> TryDownloadBitmapAsync(string? imageUrl, CancellationToken cancellationToken)
+    {
+        var normalizedUrl = NormalizeHttpUrl(imageUrl);
+        if (string.IsNullOrWhiteSpace(normalizedUrl))
+        {
+            return null;
+        }
+
+        try
+        {
+            using var request = new HttpRequestMessage(HttpMethod.Get, normalizedUrl);
+            request.Headers.TryAddWithoutValidation("User-Agent", BrowserUserAgent);
+            request.Headers.TryAddWithoutValidation("Accept", "image/avif,image/webp,image/apng,image/*,*/*;q=0.8");
+            using var response = await ImageHttpClient.SendAsync(
+                request,
+                HttpCompletionOption.ResponseHeadersRead,
+                cancellationToken);
+            if (!response.IsSuccessStatusCode)
+            {
+                return null;
+            }
+
+            await using var stream = await response.Content.ReadAsStreamAsync(cancellationToken);
+            var memory = new MemoryStream();
+            await stream.CopyToAsync(memory, cancellationToken);
+            memory.Position = 0;
+            return new Bitmap(memory);
+        }
+        catch (OperationCanceledException)
+        {
+            throw;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    private void TryOpenNewsUrl(int index)
+    {
+        if (index < 0 || index >= _newsUrls.Count)
+        {
+            return;
+        }
+
+        var normalizedUrl = NormalizeHttpUrl(_newsUrls[index]);
+        if (string.IsNullOrWhiteSpace(normalizedUrl))
+        {
+            return;
+        }
+
+        try
+        {
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = normalizedUrl,
+                UseShellExecute = true
+            };
+            Process.Start(startInfo);
+        }
+        catch
+        {
+            // Ignore malformed URLs or shell launch failures.
+        }
+    }
+
+    private static string? NormalizeHttpUrl(string? rawUrl)
+    {
+        if (string.IsNullOrWhiteSpace(rawUrl))
+        {
+            return null;
+        }
+
+        var candidate = rawUrl.Trim();
+        if (!Uri.TryCreate(candidate, UriKind.Absolute, out var uri))
+        {
+            return null;
+        }
+
+        if (!string.Equals(uri.Scheme, Uri.UriSchemeHttp, StringComparison.OrdinalIgnoreCase) &&
+            !string.Equals(uri.Scheme, Uri.UriSchemeHttps, StringComparison.OrdinalIgnoreCase))
+        {
+            return null;
+        }
+
+        return uri.ToString();
+    }
+
+    private void SetNewsBitmap(int index, Bitmap? bitmap)
+    {
+        if (index < 0 || index >= _newsBitmaps.Length)
+        {
+            bitmap?.Dispose();
+            return;
+        }
+
+        var imageControl = index == 0 ? News1Image : News2Image;
+        var oldBitmap = _newsBitmaps[index];
+        if (ReferenceEquals(imageControl.Source, oldBitmap))
+        {
+            imageControl.Source = null;
+        }
+
+        oldBitmap?.Dispose();
+        _newsBitmaps[index] = bitmap;
+        imageControl.Source = bitmap;
+    }
+
+    private void DisposeNewsBitmaps()
+    {
+        SetNewsBitmap(0, null);
+        SetNewsBitmap(1, null);
+    }
+
+    private void UpdateLanguageCode()
+    {
+        try
+        {
+            var snapshot = _settingsService.Load();
+            _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+        }
+        catch
+        {
+            _languageCode = "zh-CN";
+        }
+    }
+
+    private void ApplyAutoRotateSettings()
+    {
+        var enabled = true;
+        var intervalMinutes = 60;
+
+        try
+        {
+            var snapshot = _settingsService.Load();
+            enabled = snapshot.CnrDailyNewsAutoRotateEnabled;
+            intervalMinutes = NormalizeAutoRotateIntervalMinutes(snapshot.CnrDailyNewsAutoRotateIntervalMinutes);
+        }
+        catch
+        {
+            // Keep fallback defaults.
+        }
+
+        _autoRotateEnabled = enabled;
+        _refreshTimer.Interval = TimeSpan.FromMinutes(intervalMinutes);
+
+        if (!_isAttached)
+        {
+            return;
+        }
+
+        if (_autoRotateEnabled)
+        {
+            if (!_refreshTimer.IsEnabled)
+            {
+                _refreshTimer.Start();
+            }
+        }
+        else if (_refreshTimer.IsEnabled)
+        {
+            _refreshTimer.Stop();
+        }
+    }
+
+    private static int NormalizeAutoRotateIntervalMinutes(int minutes)
+    {
+        if (minutes <= 0)
+        {
+            return 60;
+        }
+
+        if (SupportedAutoRotateIntervalsMinutes.Contains(minutes))
+        {
+            return minutes;
+        }
+
+        return SupportedAutoRotateIntervalsMinutes
+            .OrderBy(value => Math.Abs(value - minutes))
+            .FirstOrDefault(60);
+    }
+
+    private void CancelRefreshRequest()
+    {
+        var cts = Interlocked.Exchange(ref _refreshCts, null);
+        if (cts is null)
+        {
+            return;
+        }
+
+        cts.Cancel();
+        cts.Dispose();
+    }
+
+    private string L(string key, string fallback)
+    {
+        return _localizationService.GetString(_languageCode, key, fallback);
+    }
+
+    private double ResolveScale()
+    {
+        var cellScale = Math.Clamp(_currentCellSize / BaseCellSize, 0.56, 2.0);
+        var widthScale = Bounds.Width > 1
+            ? Math.Clamp(Bounds.Width / Math.Max(1, _currentCellSize * BaseWidthCells), 0.56, 2.0)
+            : 1;
+        var heightScale = Bounds.Height > 1
+            ? Math.Clamp(Bounds.Height / Math.Max(1, _currentCellSize * BaseHeightCells), 0.56, 2.0)
+            : 1;
+        return Math.Clamp(Math.Min(cellScale, Math.Min(widthScale, heightScale)), 0.56, 2.0);
+    }
+
+    private static string NormalizeCompactText(string? text)
+    {
+        if (string.IsNullOrWhiteSpace(text))
+        {
+            return string.Empty;
+        }
+
+        return MultiWhitespaceRegex.Replace(text.Trim(), " ");
+    }
+}
+

LanMountainDesktop/Views/Components/DailyArtworkWidget.axaml

@@ -81,7 +81,7 @@
                                    FontWeight="Bold"
                                    TextWrapping="Wrap"
                                    TextTrimming="CharacterEllipsis"
-                                   MaxLines="2"
+                                   MaxLines="4"
                                    Margin="0,0,0,8" />
 
                         <Border x:Name="RightPanelSeparator"
@@ -102,16 +102,16 @@
                                        FontWeight="SemiBold"
                                        TextWrapping="Wrap"
                                        TextTrimming="CharacterEllipsis"
-                                       MaxLines="2" />
+                                       MaxLines="3" />
                             <TextBlock x:Name="YearTextBlock"
                                        Text="1754"
                                        Foreground="#D7DCE3"
                                        FontSize="22"
                                        FontWeight="Medium"
                                        FontFeatures="tnum"
-                                       TextWrapping="NoWrap"
+                                       TextWrapping="Wrap"
                                        TextTrimming="CharacterEllipsis"
-                                       MaxLines="1" />
+                                       MaxLines="2" />
                         </StackPanel>
                     </Grid>
                 </Grid>

LanMountainDesktop/Views/Components/DailyArtworkWidget.axaml.cs

@@ -34,6 +34,9 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
 
     private static readonly Regex MultiWhitespaceRegex = new(@"\s+", RegexOptions.Compiled);
     private static readonly FontFamily MiSansFontFamily = new("MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans");
+    private static readonly FontWeight[] TitleWeightCandidates = new[] { FontWeight.Bold, FontWeight.SemiBold, FontWeight.Medium, FontWeight.Normal };
+    private static readonly FontWeight[] ArtistWeightCandidates = new[] { FontWeight.SemiBold, FontWeight.Medium, FontWeight.Normal };
+    private static readonly FontWeight[] SecondaryWeightCandidates = new[] { FontWeight.Medium, FontWeight.Normal, FontWeight.Light };
 
     private static readonly HttpClient ImageHttpClient = new()
     {
@@ -452,55 +455,98 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
         var bottomStackSpacing = Math.Clamp(3 * scale, 2, 8);
         var reservedHeight = titleBottomMargin + separatorBottomMargin + bottomStackSpacing + 3;
         var textHeightBudget = Math.Max(24, rightContentHeight - reservedHeight);
-        var titleHeightBudget = Math.Max(16, textHeightBudget * 0.54);
-        var bottomTextBudget = Math.Max(10, textHeightBudget - titleHeightBudget);
-        var artistHeightBudget = Math.Max(8, bottomTextBudget * 0.66);
-        var yearHeightBudget = Math.Max(8, bottomTextBudget - artistHeightBudget);
-
         var titleBase = Math.Clamp(44 * scale, 16, 58);
-        PaintingTitleTextBlock.MaxWidth = rightContentWidth;
-        PaintingTitleTextBlock.Margin = new Thickness(0, 0, 0, titleBottomMargin);
-        PaintingTitleTextBlock.FontSize = FitFontSize(
+        var artistBase = Math.Clamp(26 * scale, 11, 34);
+        var yearBase = Math.Clamp(22 * scale, 10, 30);
+        var titleMin = Math.Max(9.2, titleBase * 0.42);
+        var artistMin = Math.Max(8.4, artistBase * 0.50);
+        var yearMin = Math.Max(8.0, yearBase * 0.54);
+
+        var titleDemand = Math.Clamp(NormalizeCompactText(PaintingTitleTextBlock.Text).Length, 6, 96);
+        var artistDemand = Math.Clamp(NormalizeCompactText(ArtistTextBlock.Text).Length, 4, 72);
+        var yearDemand = Math.Clamp(NormalizeCompactText(YearTextBlock.Text).Length, 2, 48);
+
+        var minTitleHeight = Math.Max(10, titleMin * 1.10 * 2);
+        var minArtistHeight = Math.Max(8, artistMin * 1.14);
+        var minYearHeight = Math.Max(8, yearMin * 1.08);
+        var minTextHeightTotal = minTitleHeight + minArtistHeight + minYearHeight;
+
+        double titleHeightBudget;
+        double artistHeightBudget;
+        double yearHeightBudget;
+        if (textHeightBudget <= minTextHeightTotal + 0.6)
+        {
+            var compression = textHeightBudget / Math.Max(1, minTextHeightTotal);
+            titleHeightBudget = Math.Max(9, minTitleHeight * compression);
+            artistHeightBudget = Math.Max(7, minArtistHeight * compression);
+            yearHeightBudget = Math.Max(7, minYearHeight * compression);
+        }
+        else
+        {
+            var extraHeight = textHeightBudget - minTextHeightTotal;
+            var titleWeight = titleDemand + 8d;
+            var artistWeight = artistDemand + 4d;
+            var yearWeight = yearDemand + 2d;
+            var weightSum = Math.Max(1d, titleWeight + artistWeight + yearWeight);
+
+            titleHeightBudget = minTitleHeight + extraHeight * (titleWeight / weightSum);
+            artistHeightBudget = minArtistHeight + extraHeight * (artistWeight / weightSum);
+            yearHeightBudget = minYearHeight + extraHeight * (yearWeight / weightSum);
+        }
+
+        var titleLayout = FitAdaptiveTextLayout(
             PaintingTitleTextBlock.Text,
             rightContentWidth,
             titleHeightBudget,
-            maxLines: 2,
-            minFontSize: Math.Max(12, titleBase * 0.62),
+            minLines: 2,
+            maxLines: 5,
+            minFontSize: titleMin,
             maxFontSize: titleBase,
-            weight: FontWeight.Bold,
-            lineHeightFactor: 1.12);
-        PaintingTitleTextBlock.LineHeight = PaintingTitleTextBlock.FontSize * 1.12;
+            weightCandidates: TitleWeightCandidates,
+            lineHeightFactor: 1.10);
+        PaintingTitleTextBlock.MaxWidth = rightContentWidth;
+        PaintingTitleTextBlock.Margin = new Thickness(0, 0, 0, titleBottomMargin);
+        PaintingTitleTextBlock.MaxLines = titleLayout.MaxLines;
+        PaintingTitleTextBlock.FontWeight = titleLayout.Weight;
+        PaintingTitleTextBlock.FontSize = titleLayout.FontSize;
+        PaintingTitleTextBlock.LineHeight = titleLayout.LineHeight;
 
-        var artistBase = Math.Clamp(26 * scale, 11, 34);
         if (ArtistTextBlock.Parent is StackPanel artistInfoStack)
         {
             artistInfoStack.Spacing = bottomStackSpacing;
         }
 
-        ArtistTextBlock.MaxWidth = rightContentWidth;
-        ArtistTextBlock.FontSize = FitFontSize(
+        var artistLayout = FitAdaptiveTextLayout(
             ArtistTextBlock.Text,
             rightContentWidth,
             artistHeightBudget,
-            maxLines: 2,
-            minFontSize: Math.Max(10, artistBase * 0.72),
+            minLines: 1,
+            maxLines: 4,
+            minFontSize: artistMin,
             maxFontSize: artistBase,
-            weight: FontWeight.SemiBold,
+            weightCandidates: ArtistWeightCandidates,
             lineHeightFactor: 1.14);
-        ArtistTextBlock.LineHeight = ArtistTextBlock.FontSize * 1.14;
+        ArtistTextBlock.MaxWidth = rightContentWidth;
+        ArtistTextBlock.MaxLines = artistLayout.MaxLines;
+        ArtistTextBlock.FontWeight = artistLayout.Weight;
+        ArtistTextBlock.FontSize = artistLayout.FontSize;
+        ArtistTextBlock.LineHeight = artistLayout.LineHeight;
 
-        var yearBase = Math.Clamp(22 * scale, 10, 30);
-        YearTextBlock.MaxWidth = rightContentWidth;
-        YearTextBlock.FontSize = FitFontSize(
+        var yearLayout = FitAdaptiveTextLayout(
             YearTextBlock.Text,
             rightContentWidth,
             yearHeightBudget,
-            maxLines: 1,
-            minFontSize: Math.Max(9.5, yearBase * 0.78),
+            minLines: 1,
+            maxLines: 3,
+            minFontSize: yearMin,
             maxFontSize: yearBase,
-            weight: FontWeight.Medium,
+            weightCandidates: SecondaryWeightCandidates,
             lineHeightFactor: 1.08);
-        YearTextBlock.LineHeight = YearTextBlock.FontSize * 1.08;
+        YearTextBlock.MaxWidth = rightContentWidth;
+        YearTextBlock.MaxLines = yearLayout.MaxLines;
+        YearTextBlock.FontWeight = yearLayout.Weight;
+        YearTextBlock.FontSize = yearLayout.FontSize;
+        YearTextBlock.LineHeight = yearLayout.LineHeight;
 
         RightPanelSeparator.Width = Math.Clamp(rightContentWidth * 0.58, 42, 136);
         RightPanelSeparator.Margin = new Thickness(0, 0, 0, separatorBottomMargin);
@@ -726,6 +772,170 @@ public partial class DailyArtworkWidget : UserControl, IDesktopComponentWidget,
         return best;
     }
 
+    private static AdaptiveTextLayout FitAdaptiveTextLayout(
+        string? text,
+        double maxWidth,
+        double maxHeight,
+        int minLines,
+        int maxLines,
+        double minFontSize,
+        double maxFontSize,
+        FontWeight[] weightCandidates,
+        double lineHeightFactor)
+    {
+        var content = string.IsNullOrWhiteSpace(text) ? " " : text.Trim();
+        var safeMinLines = Math.Max(1, minLines);
+        var safeMaxLines = Math.Max(safeMinLines, maxLines);
+        var linesByHeight = ResolveMaxLinesByHeight(maxHeight, minFontSize, lineHeightFactor, safeMinLines, safeMaxLines);
+
+        var candidates = weightCandidates is { Length: > 0 }
+            ? weightCandidates
+            : new[] { FontWeight.Normal };
+
+        AdaptiveTextLayout? best = null;
+        foreach (var weight in candidates)
+        {
+            for (var lineLimit = linesByHeight; lineLimit >= safeMinLines; lineLimit--)
+            {
+                var fontSize = FitFontSize(
+                    content,
+                    maxWidth,
+                    maxHeight,
+                    lineLimit,
+                    minFontSize,
+                    maxFontSize,
+                    weight,
+                    lineHeightFactor);
+                var lineHeight = fontSize * lineHeightFactor;
+                var measuredSize = MeasureTextSize(content, fontSize, weight, Math.Max(1, maxWidth), lineHeight);
+                var measuredLineCount = ResolveLineCount(measuredSize.Height, lineHeight);
+                var overflowLines = Math.Max(0, measuredLineCount - lineLimit);
+                var overflowHeight = Math.Max(0, measuredSize.Height - maxHeight);
+                var overflowScore = overflowLines * 1000d + overflowHeight;
+                var fitsCompletely = overflowLines == 0 && overflowHeight <= 0.6;
+                var candidate = new AdaptiveTextLayout(fontSize, weight, lineLimit, lineHeight, overflowScore, fitsCompletely);
+
+                if (best is null || IsBetterAdaptiveTextCandidate(candidate, best.Value))
+                {
+                    best = candidate;
+                }
+            }
+        }
+
+        if (best is not null)
+        {
+            return best.Value;
+        }
+
+        var fallbackFontSize = Math.Max(6, minFontSize);
+        return new AdaptiveTextLayout(
+            fallbackFontSize,
+            FontWeight.Normal,
+            safeMinLines,
+            fallbackFontSize * lineHeightFactor,
+            double.MaxValue,
+            fitsCompletely: false);
+    }
+
+    private static bool IsBetterAdaptiveTextCandidate(AdaptiveTextLayout candidate, AdaptiveTextLayout best)
+    {
+        if (candidate.FitsCompletely && !best.FitsCompletely)
+        {
+            return true;
+        }
+
+        if (!candidate.FitsCompletely && best.FitsCompletely)
+        {
+            return false;
+        }
+
+        if (candidate.FitsCompletely && best.FitsCompletely)
+        {
+            if (candidate.FontSize > best.FontSize + 0.12)
+            {
+                return true;
+            }
+
+            if (Math.Abs(candidate.FontSize - best.FontSize) <= 0.12 && candidate.MaxLines < best.MaxLines)
+            {
+                return true;
+            }
+
+            return false;
+        }
+
+        if (candidate.OverflowScore < best.OverflowScore - 0.2)
+        {
+            return true;
+        }
+
+        if (Math.Abs(candidate.OverflowScore - best.OverflowScore) <= 0.2 &&
+            candidate.FontSize > best.FontSize + 0.12)
+        {
+            return true;
+        }
+
+        if (Math.Abs(candidate.OverflowScore - best.OverflowScore) <= 0.2 &&
+            Math.Abs(candidate.FontSize - best.FontSize) <= 0.12 &&
+            candidate.MaxLines > best.MaxLines)
+        {
+            return true;
+        }
+
+        return false;
+    }
+
+    private static int ResolveMaxLinesByHeight(
+        double maxHeight,
+        double minFontSize,
+        double lineHeightFactor,
+        int minLines,
+        int maxLines)
+    {
+        var safeMinLines = Math.Max(1, minLines);
+        var safeMaxLines = Math.Max(safeMinLines, maxLines);
+        var lineHeight = Math.Max(1, Math.Max(6, minFontSize) * lineHeightFactor);
+        var maxHeightWithTolerance = Math.Max(1, maxHeight + 0.6);
+        var linesByHeight = (int)Math.Floor(maxHeightWithTolerance / lineHeight);
+        return Math.Clamp(linesByHeight, safeMinLines, safeMaxLines);
+    }
+
+    private static int ResolveLineCount(double measuredHeight, double lineHeight)
+    {
+        return Math.Max(1, (int)Math.Ceiling(measuredHeight / Math.Max(1, lineHeight)));
+    }
+
+    private readonly struct AdaptiveTextLayout
+    {
+        public AdaptiveTextLayout(
+            double fontSize,
+            FontWeight weight,
+            int maxLines,
+            double lineHeight,
+            double overflowScore,
+            bool fitsCompletely)
+        {
+            FontSize = fontSize;
+            Weight = weight;
+            MaxLines = Math.Max(1, maxLines);
+            LineHeight = lineHeight;
+            OverflowScore = overflowScore;
+            FitsCompletely = fitsCompletely;
+        }
+
+        public double FontSize { get; }
+
+        public FontWeight Weight { get; }
+
+        public int MaxLines { get; }
+
+        public double LineHeight { get; }
+
+        public double OverflowScore { get; }
+
+        public bool FitsCompletely { get; }
+    }
+
     private static Size MeasureTextSize(string text, double fontSize, FontWeight weight, double maxWidth, double lineHeight)
     {
         var probe = new TextBlock

LanMountainDesktop/Views/Components/DailyWordWidget.axaml

@@ -0,0 +1,129 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:fi="using:FluentIcons.Avalonia"
+             xmlns:shapes="clr-namespace:Avalonia.Controls.Shapes;assembly=Avalonia.Controls"
+             mc:Ignorable="d"
+             d:DesignWidth="640"
+             d:DesignHeight="320"
+             x:Class="LanMountainDesktop.Views.Components.DailyWordWidget">
+
+    <Border x:Name="RootBorder"
+            CornerRadius="34"
+            Background="Transparent"
+            ClipToBounds="True"
+            BorderThickness="0"
+            Padding="0">
+        <Grid>
+            <Border x:Name="CardBorder"
+                    Background="#FCFBFA"
+                    CornerRadius="34"
+                    BorderBrush="Transparent"
+                    BorderThickness="0"
+                    Padding="16,14,16,14">
+                <Grid>
+                    <Grid IsHitTestVisible="False">
+                        <shapes:Ellipse x:Name="HaloEllipse"
+                                        Width="290"
+                                        Height="290"
+                                        HorizontalAlignment="Right"
+                                        VerticalAlignment="Top"
+                                        Margin="0,-106,-52,0"
+                                        Fill="#14F3C9B4" />
+
+                        <Border x:Name="AccentCorner"
+                                Width="116"
+                                Height="116"
+                                HorizontalAlignment="Right"
+                                VerticalAlignment="Bottom"
+                                Margin="0,0,-34,-34"
+                                CornerRadius="58"
+                                Background="#23F29A7A" />
+                    </Grid>
+
+                    <Grid RowDefinitions="Auto,Auto,*,Auto"
+                          RowSpacing="7">
+                        <Grid Grid.Row="0"
+                              ColumnDefinitions="*,Auto"
+                              ColumnSpacing="8">
+                            <TextBlock x:Name="WordTextBlock"
+                                       Text="illustrate"
+                                       Foreground="#F07541"
+                                       FontSize="56"
+                                       FontWeight="Bold"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="1"
+                                       VerticalAlignment="Center" />
+
+                            <Button x:Name="RefreshButton"
+                                    Grid.Column="1"
+                                    Width="38"
+                                    Height="38"
+                                    CornerRadius="19"
+                                    Background="#14A0A6AF"
+                                    BorderBrush="Transparent"
+                                    BorderThickness="0"
+                                    Padding="0"
+                                    Focusable="False">
+                                <fi:SymbolIcon x:Name="RefreshIcon"
+                                               Symbol="ArrowClockwise"
+                                               IconVariant="Regular"
+                                               FontSize="19"
+                                               Foreground="#626870" />
+                            </Button>
+                        </Grid>
+
+                        <TextBlock x:Name="PronunciationTextBlock"
+                                   Grid.Row="1"
+                                   Text="英 /ˈɪləstreɪt/ · 美 /ˈɪləstreɪt/"
+                                   Foreground="#6B7078"
+                                   FontSize="27"
+                                   FontWeight="SemiBold"
+                                   TextTrimming="CharacterEllipsis"
+                                   MaxLines="1" />
+
+                        <TextBlock x:Name="MeaningTextBlock"
+                                   Grid.Row="2"
+                                   Text="vt. 说明；阐明；举例证明；加插图"
+                                   Foreground="#2B2F35"
+                                   FontSize="25"
+                                   FontWeight="SemiBold"
+                                   TextWrapping="Wrap"
+                                   TextTrimming="CharacterEllipsis"
+                                   MaxLines="2"
+                                   VerticalAlignment="Top" />
+
+                        <StackPanel Grid.Row="3"
+                                    Spacing="2">
+                            <TextBlock x:Name="ExampleTextBlock"
+                                       Text="One example will suffice to illustrate the point."
+                                       Foreground="#2B2F35"
+                                       FontSize="22"
+                                       FontWeight="Medium"
+                                       TextWrapping="Wrap"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="2" />
+                            <TextBlock x:Name="ExampleTranslationTextBlock"
+                                       Text="一个例子就足以说明这个观点。"
+                                       Foreground="#7A8088"
+                                       FontSize="20"
+                                       FontWeight="Medium"
+                                       TextWrapping="Wrap"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="1" />
+                        </StackPanel>
+                    </Grid>
+                </Grid>
+            </Border>
+
+            <TextBlock x:Name="StatusTextBlock"
+                       IsVisible="False"
+                       Text="Loading"
+                       Foreground="#6A6F77"
+                       FontSize="16"
+                       HorizontalAlignment="Center"
+                       VerticalAlignment="Center" />
+        </Grid>
+    </Border>
+</UserControl>

LanMountainDesktop/Views/Components/DailyWordWidget.axaml.cs

@@ -0,0 +1,498 @@
+using System;
+using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Media;
+using Avalonia.Threading;
+using LanMountainDesktop.Models;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+public partial class DailyWordWidget : UserControl, IDesktopComponentWidget, IRecommendationInfoAwareComponentWidget
+{
+    private static readonly Regex MultiWhitespaceRegex = new(@"\s+", RegexOptions.Compiled);
+    private static readonly FontFamily MiSansFontFamily = new("MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans");
+    private static readonly IRecommendationInfoService DefaultRecommendationService = new RecommendationDataService();
+
+    private const double BaseCellSize = 48d;
+    private const int BaseWidthCells = 4;
+    private const int BaseHeightCells = 2;
+
+    private readonly DispatcherTimer _refreshTimer = new()
+    {
+        Interval = TimeSpan.FromHours(6)
+    };
+
+    private readonly AppSettingsService _settingsService = new();
+    private readonly LocalizationService _localizationService = new();
+
+    private IRecommendationInfoService _recommendationService = DefaultRecommendationService;
+    private CancellationTokenSource? _refreshCts;
+    private string _languageCode = "zh-CN";
+    private double _currentCellSize = BaseCellSize;
+    private bool _isAttached;
+    private bool _isRefreshing;
+
+    public DailyWordWidget()
+    {
+        InitializeComponent();
+
+        WordTextBlock.FontFamily = MiSansFontFamily;
+        PronunciationTextBlock.FontFamily = MiSansFontFamily;
+        MeaningTextBlock.FontFamily = MiSansFontFamily;
+        ExampleTextBlock.FontFamily = MiSansFontFamily;
+        ExampleTranslationTextBlock.FontFamily = MiSansFontFamily;
+        StatusTextBlock.FontFamily = MiSansFontFamily;
+
+        _refreshTimer.Tick += OnRefreshTimerTick;
+        RefreshButton.Click += OnRefreshButtonClick;
+        AttachedToVisualTree += OnAttachedToVisualTree;
+        DetachedFromVisualTree += OnDetachedFromVisualTree;
+        SizeChanged += OnSizeChanged;
+
+        ApplyCellSize(_currentCellSize);
+        UpdateLanguageCode();
+        ApplyLoadingState();
+        UpdateRefreshButtonState();
+    }
+
+    public void ApplyCellSize(double cellSize)
+    {
+        _currentCellSize = Math.Max(1, cellSize);
+        UpdateAdaptiveLayout();
+    }
+
+    public void SetRecommendationInfoService(IRecommendationInfoService recommendationInfoService)
+    {
+        _recommendationService = recommendationInfoService ?? DefaultRecommendationService;
+        if (_isAttached)
+        {
+            _ = RefreshWordAsync(forceRefresh: false);
+        }
+    }
+
+    public void RefreshFromSettings()
+    {
+        _recommendationService.ClearCache();
+        if (_isAttached)
+        {
+            _ = RefreshWordAsync(forceRefresh: true);
+        }
+    }
+
+    private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = true;
+        UpdateRefreshButtonState();
+        _refreshTimer.Start();
+        _ = RefreshWordAsync(forceRefresh: false);
+    }
+
+    private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = false;
+        _refreshTimer.Stop();
+        CancelRefreshRequest();
+        UpdateRefreshButtonState();
+    }
+
+    private void OnSizeChanged(object? sender, SizeChangedEventArgs e)
+    {
+        ApplyCellSize(_currentCellSize);
+    }
+
+    private async void OnRefreshButtonClick(object? sender, RoutedEventArgs e)
+    {
+        if (_isRefreshing)
+        {
+            return;
+        }
+
+        await RefreshWordAsync(forceRefresh: true);
+        e.Handled = true;
+    }
+
+    private async void OnRefreshTimerTick(object? sender, EventArgs e)
+    {
+        await RefreshWordAsync(forceRefresh: false);
+    }
+
+    private async Task RefreshWordAsync(bool forceRefresh)
+    {
+        if (!_isAttached || _isRefreshing)
+        {
+            return;
+        }
+
+        _isRefreshing = true;
+        UpdateRefreshButtonState();
+        UpdateLanguageCode();
+
+        var cts = new CancellationTokenSource();
+        var previous = Interlocked.Exchange(ref _refreshCts, cts);
+        previous?.Cancel();
+        previous?.Dispose();
+
+        try
+        {
+            var query = new DailyWordQuery(
+                Locale: _languageCode,
+                ForceRefresh: forceRefresh);
+            var result = await _recommendationService.GetDailyWordAsync(query, cts.Token);
+            if (!_isAttached || cts.IsCancellationRequested)
+            {
+                return;
+            }
+
+            if (!result.Success || result.Data is null)
+            {
+                ApplyFailedState();
+                return;
+            }
+
+            ApplySnapshot(result.Data);
+        }
+        catch (OperationCanceledException)
+        {
+            // Ignore canceled requests.
+        }
+        catch
+        {
+            if (_isAttached && !cts.IsCancellationRequested)
+            {
+                ApplyFailedState();
+            }
+        }
+        finally
+        {
+            if (ReferenceEquals(_refreshCts, cts))
+            {
+                _refreshCts = null;
+            }
+
+            cts.Dispose();
+            _isRefreshing = false;
+            UpdateRefreshButtonState();
+        }
+    }
+
+    private void ApplySnapshot(DailyWordSnapshot snapshot)
+    {
+        WordTextBlock.Text = NormalizeCompactText(snapshot.Word);
+        PronunciationTextBlock.Text = BuildPronunciationText(snapshot);
+        MeaningTextBlock.Text = BuildMeaningText(snapshot.Meaning);
+        ExampleTextBlock.Text = BuildExampleText(snapshot.ExampleSentence);
+        ExampleTranslationTextBlock.Text = BuildExampleTranslation(snapshot.ExampleTranslation);
+
+        StatusTextBlock.IsVisible = false;
+        UpdateAdaptiveLayout();
+    }
+
+    private void ApplyLoadingState()
+    {
+        WordTextBlock.Text = L("dailyword.widget.loading_word", "daily word");
+        PronunciationTextBlock.Text = L("dailyword.widget.loading_pronunciation", "Fetching pronunciation...");
+        MeaningTextBlock.Text = L("dailyword.widget.loading_meaning", "Fetching meaning...");
+        ExampleTextBlock.Text = L("dailyword.widget.loading_example", "Fetching example sentence...");
+        ExampleTranslationTextBlock.Text = L("dailyword.widget.loading_example_translation", "Loading...");
+        StatusTextBlock.Text = L("dailyword.widget.loading", "Loading...");
+        StatusTextBlock.IsVisible = true;
+        UpdateAdaptiveLayout();
+    }
+
+    private void ApplyFailedState()
+    {
+        WordTextBlock.Text = L("dailyword.widget.fallback_word", "daily word");
+        PronunciationTextBlock.Text = L("dailyword.widget.fallback_pronunciation", "Pronunciation unavailable");
+        MeaningTextBlock.Text = L("dailyword.widget.fallback_meaning", "Youdao dictionary is temporarily unavailable.");
+        ExampleTextBlock.Text = L("dailyword.widget.fallback_example", "Tap the refresh button and try again.");
+        ExampleTranslationTextBlock.Text = L("dailyword.widget.fallback_example_translation", "It will retry when network recovers.");
+        StatusTextBlock.Text = L("dailyword.widget.fetch_failed", "Daily word fetch failed");
+        StatusTextBlock.IsVisible = true;
+        UpdateAdaptiveLayout();
+    }
+
+    private void UpdateAdaptiveLayout()
+    {
+        var scale = ResolveScale();
+        var totalWidth = Bounds.Width > 1 ? Bounds.Width : _currentCellSize * BaseWidthCells;
+        var totalHeight = Bounds.Height > 1 ? Bounds.Height : _currentCellSize * BaseHeightCells;
+
+        RootBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * scale, 16, 52));
+        RootBorder.Padding = new Thickness(0);
+
+        CardBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * scale, 16, 52));
+        CardBorder.Padding = new Thickness(
+            Math.Clamp(16 * scale, 8, 24),
+            Math.Clamp(14 * scale, 7, 22),
+            Math.Clamp(16 * scale, 8, 24),
+            Math.Clamp(14 * scale, 7, 22));
+
+        var refreshSize = Math.Clamp(38 * scale, 22, 48);
+        RefreshButton.Width = refreshSize;
+        RefreshButton.Height = refreshSize;
+        RefreshButton.CornerRadius = new CornerRadius(refreshSize / 2d);
+        RefreshIcon.FontSize = Math.Clamp(19 * scale, 12, 26);
+
+        HaloEllipse.Width = Math.Clamp(totalWidth * 0.52, 120, 340);
+        HaloEllipse.Height = HaloEllipse.Width;
+        AccentCorner.Width = Math.Clamp(totalWidth * 0.20, 66, 132);
+        AccentCorner.Height = AccentCorner.Width;
+        AccentCorner.CornerRadius = new CornerRadius(AccentCorner.Width / 2d);
+
+        var horizontalPadding = RootBorder.Padding.Left + RootBorder.Padding.Right + CardBorder.Padding.Left + CardBorder.Padding.Right;
+        var contentWidth = Math.Max(98, totalWidth - horizontalPadding);
+        var wordWidth = Math.Max(70, contentWidth - refreshSize - Math.Clamp(8 * scale, 5, 14));
+        WordTextBlock.MaxWidth = wordWidth;
+        PronunciationTextBlock.MaxWidth = contentWidth;
+        MeaningTextBlock.MaxWidth = contentWidth;
+        ExampleTextBlock.MaxWidth = contentWidth;
+        ExampleTranslationTextBlock.MaxWidth = contentWidth;
+
+        var compactLayout = totalHeight < _currentCellSize * 1.72;
+        MeaningTextBlock.MaxLines = compactLayout ? 1 : 2;
+        ExampleTextBlock.MaxLines = compactLayout ? 1 : 2;
+        ExampleTranslationTextBlock.IsVisible = !compactLayout;
+        ExampleTranslationTextBlock.MaxLines = 1;
+
+        var contentHeight = Math.Max(52, totalHeight - RootBorder.Padding.Top - RootBorder.Padding.Bottom - CardBorder.Padding.Top - CardBorder.Padding.Bottom);
+        var wordHeightBudget = Math.Max(18, contentHeight * 0.24);
+        var pronunciationHeightBudget = Math.Max(14, contentHeight * 0.16);
+        var meaningHeightBudget = Math.Max(16, contentHeight * (compactLayout ? 0.26 : 0.30));
+        var exampleHeightBudget = Math.Max(16, contentHeight - wordHeightBudget - pronunciationHeightBudget - meaningHeightBudget - Math.Clamp(16 * scale, 8, 24));
+        if (!ExampleTranslationTextBlock.IsVisible)
+        {
+            exampleHeightBudget += Math.Clamp(11 * scale, 5, 18);
+        }
+
+        var wordBase = Math.Clamp(56 * scale, 18, 72);
+        WordTextBlock.FontSize = FitFontSize(
+            WordTextBlock.Text,
+            wordWidth,
+            wordHeightBudget,
+            maxLines: 1,
+            minFontSize: Math.Max(14, wordBase * 0.56),
+            maxFontSize: wordBase,
+            weight: FontWeight.Bold,
+            lineHeightFactor: 1.04);
+        WordTextBlock.LineHeight = WordTextBlock.FontSize * 1.04;
+
+        var pronunciationBase = Math.Clamp(27 * scale, 10, 36);
+        PronunciationTextBlock.FontSize = FitFontSize(
+            PronunciationTextBlock.Text,
+            contentWidth,
+            pronunciationHeightBudget,
+            maxLines: 1,
+            minFontSize: Math.Max(8.6, pronunciationBase * 0.62),
+            maxFontSize: pronunciationBase,
+            weight: FontWeight.SemiBold,
+            lineHeightFactor: 1.08);
+        PronunciationTextBlock.LineHeight = PronunciationTextBlock.FontSize * 1.08;
+
+        var meaningBase = Math.Clamp(25 * scale, 10, 34);
+        MeaningTextBlock.FontSize = FitFontSize(
+            MeaningTextBlock.Text,
+            contentWidth,
+            meaningHeightBudget,
+            maxLines: Math.Max(1, MeaningTextBlock.MaxLines),
+            minFontSize: Math.Max(9.2, meaningBase * 0.60),
+            maxFontSize: meaningBase,
+            weight: FontWeight.SemiBold,
+            lineHeightFactor: 1.10);
+        MeaningTextBlock.LineHeight = MeaningTextBlock.FontSize * 1.10;
+
+        var exampleBase = Math.Clamp(22 * scale, 9, 30);
+        ExampleTextBlock.FontSize = FitFontSize(
+            ExampleTextBlock.Text,
+            contentWidth,
+            exampleHeightBudget,
+            maxLines: Math.Max(1, ExampleTextBlock.MaxLines),
+            minFontSize: Math.Max(8.8, exampleBase * 0.58),
+            maxFontSize: exampleBase,
+            weight: FontWeight.Medium,
+            lineHeightFactor: 1.08);
+        ExampleTextBlock.LineHeight = ExampleTextBlock.FontSize * 1.08;
+
+        var translationBase = Math.Clamp(20 * scale, 8, 28);
+        ExampleTranslationTextBlock.FontSize = FitFontSize(
+            ExampleTranslationTextBlock.Text,
+            contentWidth,
+            Math.Max(10, exampleHeightBudget * 0.44),
+            maxLines: 1,
+            minFontSize: Math.Max(7.8, translationBase * 0.62),
+            maxFontSize: translationBase,
+            weight: FontWeight.Medium,
+            lineHeightFactor: 1.06);
+        ExampleTranslationTextBlock.LineHeight = ExampleTranslationTextBlock.FontSize * 1.06;
+
+        StatusTextBlock.FontSize = Math.Clamp(16 * scale, 9, 24);
+    }
+
+    private void UpdateRefreshButtonState()
+    {
+        RefreshButton.IsEnabled = !_isRefreshing;
+        RefreshButton.Opacity = _isAttached ? 1.0 : 0.85;
+        RefreshIcon.Opacity = _isRefreshing ? 0.56 : 1.0;
+    }
+
+    private void UpdateLanguageCode()
+    {
+        try
+        {
+            var snapshot = _settingsService.Load();
+            _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+        }
+        catch
+        {
+            _languageCode = "zh-CN";
+        }
+    }
+
+    private void CancelRefreshRequest()
+    {
+        var cts = Interlocked.Exchange(ref _refreshCts, null);
+        if (cts is null)
+        {
+            return;
+        }
+
+        cts.Cancel();
+        cts.Dispose();
+    }
+
+    private string L(string key, string fallback)
+    {
+        return _localizationService.GetString(_languageCode, key, fallback);
+    }
+
+    private double ResolveScale()
+    {
+        var cellScale = Math.Clamp(_currentCellSize / BaseCellSize, 0.56, 2.0);
+        var widthScale = Bounds.Width > 1
+            ? Math.Clamp(Bounds.Width / Math.Max(1, _currentCellSize * BaseWidthCells), 0.56, 2.0)
+            : 1;
+        var heightScale = Bounds.Height > 1
+            ? Math.Clamp(Bounds.Height / Math.Max(1, _currentCellSize * BaseHeightCells), 0.56, 2.0)
+            : 1;
+        return Math.Clamp(Math.Min(cellScale, Math.Min(widthScale, heightScale)), 0.56, 2.0);
+    }
+
+    private string BuildPronunciationText(DailyWordSnapshot snapshot)
+    {
+        var uk = NormalizeCompactText(snapshot.UkPronunciation);
+        var us = NormalizeCompactText(snapshot.UsPronunciation);
+        var isZh = string.Equals(_languageCode, "zh-CN", StringComparison.OrdinalIgnoreCase);
+
+        if (!string.IsNullOrWhiteSpace(uk) && !string.IsNullOrWhiteSpace(us))
+        {
+            return isZh
+                ? $"英 /{uk}/ · 美 /{us}/"
+                : $"UK /{uk}/ · US /{us}/";
+        }
+
+        if (!string.IsNullOrWhiteSpace(uk))
+        {
+            return isZh ? $"英 /{uk}/" : $"UK /{uk}/";
+        }
+
+        if (!string.IsNullOrWhiteSpace(us))
+        {
+            return isZh ? $"美 /{us}/" : $"US /{us}/";
+        }
+
+        return isZh ? "英/美 发音暂无" : "Pronunciation unavailable";
+    }
+
+    private static string BuildMeaningText(string? rawMeaning)
+    {
+        var normalized = NormalizeCompactText(rawMeaning);
+        return string.IsNullOrWhiteSpace(normalized)
+            ? "Meaning unavailable"
+            : normalized;
+    }
+
+    private static string BuildExampleText(string? sentence)
+    {
+        var normalized = NormalizeCompactText(sentence);
+        return string.IsNullOrWhiteSpace(normalized)
+            ? "No example sentence."
+            : normalized;
+    }
+
+    private static string BuildExampleTranslation(string? translation)
+    {
+        var normalized = NormalizeCompactText(translation);
+        return string.IsNullOrWhiteSpace(normalized)
+            ? string.Empty
+            : normalized;
+    }
+
+    private static string NormalizeCompactText(string? text)
+    {
+        if (string.IsNullOrWhiteSpace(text))
+        {
+            return string.Empty;
+        }
+
+        return MultiWhitespaceRegex.Replace(text.Trim(), " ");
+    }
+
+    private static double FitFontSize(
+        string? text,
+        double maxWidth,
+        double maxHeight,
+        int maxLines,
+        double minFontSize,
+        double maxFontSize,
+        FontWeight weight,
+        double lineHeightFactor)
+    {
+        var content = string.IsNullOrWhiteSpace(text) ? " " : text.Trim();
+        var min = Math.Max(6, minFontSize);
+        var max = Math.Max(min, maxFontSize);
+        var low = min;
+        var high = max;
+        var best = min;
+
+        for (var i = 0; i < 18; i++)
+        {
+            var candidate = (low + high) / 2d;
+            var lineHeight = candidate * lineHeightFactor;
+            var size = MeasureTextSize(content, candidate, weight, Math.Max(1, maxWidth), lineHeight);
+            var lineCount = Math.Max(1, (int)Math.Ceiling(size.Height / Math.Max(1, lineHeight)));
+            var fits = size.Height <= maxHeight + 0.6 && lineCount <= Math.Max(1, maxLines);
+
+            if (fits)
+            {
+                best = candidate;
+                low = candidate;
+            }
+            else
+            {
+                high = candidate;
+            }
+        }
+
+        return best;
+    }
+
+    private static Size MeasureTextSize(string text, double fontSize, FontWeight weight, double maxWidth, double lineHeight)
+    {
+        var probe = new TextBlock
+        {
+            Text = text,
+            FontFamily = MiSansFontFamily,
+            FontSize = fontSize,
+            FontWeight = weight,
+            TextWrapping = TextWrapping.Wrap,
+            LineHeight = lineHeight
+        };
+
+        probe.Measure(new Size(Math.Max(1, maxWidth), double.PositiveInfinity));
+        return probe.DesiredSize;
+    }
+}

LanMountainDesktop/Views/Components/DesktopComponentRuntimeRegistry.cs

@@ -41,7 +41,8 @@ public sealed class DesktopComponentRuntimeDescriptor
         double cellSize,
         TimeZoneService timeZoneService,
         IWeatherInfoService weatherInfoService,
-        IRecommendationInfoService recommendationInfoService)
+        IRecommendationInfoService recommendationInfoService,
+        ICalculatorDataService calculatorDataService)
     {
         var control = _controlFactory();
         if (control is IDesktopComponentWidget sizedComponent)
@@ -64,6 +65,11 @@ public sealed class DesktopComponentRuntimeDescriptor
             recommendationInfoAwareComponent.SetRecommendationInfoService(recommendationInfoService);
         }
 
+        if (control is ICalculatorInfoAwareComponentWidget calculatorInfoAwareComponent)
+        {
+            calculatorInfoAwareComponent.SetCalculatorDataService(calculatorDataService);
+        }
+
         return control;
     }
 
@@ -229,6 +235,26 @@ public sealed class DesktopComponentRuntimeRegistry
                     "component.daily_artwork",
                     () => new DailyArtworkWidget(),
                     cellSize => Math.Clamp(cellSize * 0.34, 14, 30)),
+                new DesktopComponentRuntimeRegistration(
+                    BuiltInComponentIds.DesktopDailyWord,
+                    "component.daily_word",
+                    () => new DailyWordWidget(),
+                    cellSize => Math.Clamp(cellSize * 0.34, 14, 30)),
+                new DesktopComponentRuntimeRegistration(
+                    BuiltInComponentIds.DesktopCnrDailyNews,
+                    "component.cnr_daily_news",
+                    () => new CnrDailyNewsWidget(),
+                    cellSize => Math.Clamp(cellSize * 0.34, 14, 30)),
+                new DesktopComponentRuntimeRegistration(
+                    BuiltInComponentIds.DesktopBilibiliHotSearch,
+                    "component.bilibili_hot_search",
+                    () => new BilibiliHotSearchWidget(),
+                    cellSize => Math.Clamp(cellSize * 0.34, 14, 30)),
+                new DesktopComponentRuntimeRegistration(
+                    BuiltInComponentIds.DesktopExchangeRateCalculator,
+                    "component.exchange_rate_converter",
+                    () => new ExchangeRateCalculatorWidget(),
+                    cellSize => Math.Clamp(cellSize * 0.28, 12, 26)),
                 new DesktopComponentRuntimeRegistration(
                     BuiltInComponentIds.DesktopWhiteboard,
                     "component.whiteboard",

LanMountainDesktop/Views/Components/ExchangeRateCalculatorWidget.axaml

@@ -0,0 +1,194 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d"
+             d:DesignWidth="320"
+             d:DesignHeight="320"
+             x:Class="LanMountainDesktop.Views.Components.ExchangeRateCalculatorWidget">
+
+    <UserControl.Styles>
+        <Style Selector="Button">
+            <Setter Property="CornerRadius" Value="16" />
+            <Setter Property="Background" Value="#F8F9FB" />
+            <Setter Property="BorderBrush" Value="#00000000" />
+            <Setter Property="BorderThickness" Value="0" />
+            <Setter Property="FontSize" Value="26" />
+            <Setter Property="FontWeight" Value="SemiBold" />
+            <Setter Property="Foreground" Value="#111723" />
+            <Setter Property="Padding" Value="0" />
+        </Style>
+    </UserControl.Styles>
+
+    <Border x:Name="RootBorder"
+            CornerRadius="34"
+            ClipToBounds="True"
+            Padding="12"
+            Background="#ECEDEF">
+        <Viewbox Stretch="Uniform">
+            <Grid x:Name="LayoutRoot"
+                  Width="304"
+                  Height="304"
+                  RowDefinitions="Auto,Auto,*"
+                  RowSpacing="8">
+                <Grid Grid.Row="0"
+                      ColumnDefinitions="*,62"
+                      RowDefinitions="Auto,Auto"
+                      RowSpacing="8"
+                      ColumnSpacing="8">
+                    <Border x:Name="FromCurrencyRowBorder"
+                            Grid.Row="0"
+                            Grid.Column="0"
+                            CornerRadius="16"
+                            Background="#F8F9FB"
+                            Padding="12,8"
+                            PointerPressed="OnFromCurrencyRowPointerPressed">
+                        <Grid ColumnDefinitions="Auto,Auto,*"
+                              ColumnSpacing="8">
+                            <StackPanel Orientation="Vertical"
+                                        Spacing="1"
+                                        VerticalAlignment="Center">
+                                <TextBlock x:Name="FromCurrencyCodeTextBlock"
+                                           Text="USD"
+                                           FontSize="18"
+                                           FontWeight="SemiBold"
+                                           Foreground="#121722" />
+                                <TextBlock x:Name="FromCurrencyNameTextBlock"
+                                           Text="美元"
+                                           FontSize="13"
+                                           Foreground="#6C7382" />
+                            </StackPanel>
+                            <TextBlock Grid.Column="1"
+                                       Text=">"
+                                       FontSize="18"
+                                       Foreground="#A3A9B6"
+                                       VerticalAlignment="Center" />
+                            <TextBlock x:Name="InputAmountTextBlock"
+                                       Grid.Column="2"
+                                       Text="100"
+                                       FontSize="42"
+                                       FontWeight="Bold"
+                                       Foreground="#F08D20"
+                                       TextAlignment="Right"
+                                       VerticalAlignment="Center"
+                                       HorizontalAlignment="Right"
+                                       MaxLines="1"
+                                       TextTrimming="CharacterEllipsis" />
+                        </Grid>
+                    </Border>
+
+                    <Border x:Name="ToCurrencyRowBorder"
+                            Grid.Row="1"
+                            Grid.Column="0"
+                            CornerRadius="16"
+                            Background="#F8F9FB"
+                            Padding="12,8"
+                            PointerPressed="OnToCurrencyRowPointerPressed">
+                        <Grid ColumnDefinitions="Auto,Auto,*"
+                              ColumnSpacing="8">
+                            <StackPanel Orientation="Vertical"
+                                        Spacing="1"
+                                        VerticalAlignment="Center">
+                                <TextBlock x:Name="ToCurrencyCodeTextBlock"
+                                           Text="CNY"
+                                           FontSize="18"
+                                           FontWeight="SemiBold"
+                                           Foreground="#121722" />
+                                <TextBlock x:Name="ToCurrencyNameTextBlock"
+                                           Text="人民币"
+                                           FontSize="13"
+                                           Foreground="#6C7382" />
+                            </StackPanel>
+                            <TextBlock Grid.Column="1"
+                                       Text=">"
+                                       FontSize="18"
+                                       Foreground="#A3A9B6"
+                                       VerticalAlignment="Center" />
+                            <TextBlock x:Name="ConvertedAmountTextBlock"
+                                       Grid.Column="2"
+                                       Text="0"
+                                       FontSize="42"
+                                       FontWeight="Bold"
+                                       Foreground="#0F1622"
+                                       TextAlignment="Right"
+                                       VerticalAlignment="Center"
+                                       HorizontalAlignment="Right"
+                                       MaxLines="1"
+                                       TextTrimming="CharacterEllipsis" />
+                        </Grid>
+                    </Border>
+
+                    <Button x:Name="SwapCurrencyButton"
+                            Grid.Row="0"
+                            Grid.RowSpan="2"
+                            Grid.Column="1"
+                            CornerRadius="16"
+                            Background="#F8F9FB"
+                            BorderBrush="#00000000"
+                            BorderThickness="0"
+                            FontSize="30"
+                            Content="⇅"
+                            Click="OnSwapCurrencyButtonClick" />
+                </Grid>
+
+                <TextBlock x:Name="RateTextBlock"
+                           Grid.Row="1"
+                           Text="1 USD = 0 CNY"
+                           FontSize="14"
+                           Foreground="#646D7D"
+                           Margin="4,0,0,0"
+                           MaxLines="1"
+                           TextTrimming="CharacterEllipsis" />
+
+                <Grid Grid.Row="2"
+                      ColumnDefinitions="*,*,*,84"
+                      RowDefinitions="*,*,*,*"
+                      RowSpacing="8"
+                      ColumnSpacing="8">
+                    <Button Grid.Row="0" Grid.Column="0" Content="7" Tag="7" Click="OnInputButtonClick" />
+                    <Button Grid.Row="0" Grid.Column="1" Content="8" Tag="8" Click="OnInputButtonClick" />
+                    <Button Grid.Row="0" Grid.Column="2" Content="9" Tag="9" Click="OnInputButtonClick" />
+
+                    <Button Grid.Row="1" Grid.Column="0" Content="4" Tag="4" Click="OnInputButtonClick" />
+                    <Button Grid.Row="1" Grid.Column="1" Content="5" Tag="5" Click="OnInputButtonClick" />
+                    <Button Grid.Row="1" Grid.Column="2" Content="6" Tag="6" Click="OnInputButtonClick" />
+
+                    <Button Grid.Row="2" Grid.Column="0" Content="1" Tag="1" Click="OnInputButtonClick" />
+                    <Button Grid.Row="2" Grid.Column="1" Content="2" Tag="2" Click="OnInputButtonClick" />
+                    <Button Grid.Row="2" Grid.Column="2" Content="3" Tag="3" Click="OnInputButtonClick" />
+
+                    <Button Grid.Row="3" Grid.Column="0" Content="00" Tag="00" Click="OnInputButtonClick" />
+                    <Button Grid.Row="3" Grid.Column="1" Content="0" Tag="0" Click="OnInputButtonClick" />
+                    <Button Grid.Row="3" Grid.Column="2" Content="." Tag="." Click="OnInputButtonClick" />
+
+                    <Button x:Name="ClearButton"
+                            Grid.Row="0"
+                            Grid.RowSpan="2"
+                            Grid.Column="3"
+                            Content="AC"
+                            Background="#D9DDE4"
+                            Tag="AC"
+                            Click="OnInputButtonClick" />
+
+                    <Button x:Name="BackspaceButton"
+                            Grid.Row="2"
+                            Grid.RowSpan="2"
+                            Grid.Column="3"
+                            Content="⌫"
+                            Background="#D9DDE4"
+                            Tag="BACK"
+                            Click="OnInputButtonClick" />
+                </Grid>
+
+                <TextBlock x:Name="StatusTextBlock"
+                           Grid.RowSpan="3"
+                           IsVisible="False"
+                           Text="Loading"
+                           Foreground="#5E6677"
+                           FontSize="15"
+                           HorizontalAlignment="Center"
+                           VerticalAlignment="Center" />
+            </Grid>
+        </Viewbox>
+    </Border>
+</UserControl>

LanMountainDesktop/Views/Components/ExchangeRateCalculatorWidget.axaml.cs

@@ -0,0 +1,347 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Media;
+using Avalonia.Threading;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+public partial class ExchangeRateCalculatorWidget : UserControl, IDesktopComponentWidget, IRecommendationInfoAwareComponentWidget, ICalculatorInfoAwareComponentWidget
+{
+    private sealed record CurrencyItem(string Code, string ZhName, string EnName);
+
+    private static readonly FontFamily MiSansFontFamily = new("MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans");
+    private static readonly CurrencyItem[] CurrencyItems =
+    [
+        new("USD", "美元", "US Dollar"),
+        new("CNY", "人民币", "Chinese Yuan"),
+        new("EUR", "欧元", "Euro"),
+        new("JPY", "日元", "Japanese Yen"),
+        new("HKD", "港币", "Hong Kong Dollar"),
+        new("GBP", "英镑", "British Pound")
+    ];
+
+    private static readonly IRecommendationInfoService DefaultRecommendationService = new RecommendationDataService();
+    private static readonly ICalculatorDataService DefaultCalculatorService = new CalculatorDataService();
+
+    private readonly DispatcherTimer _refreshTimer = new()
+    {
+        Interval = TimeSpan.FromMinutes(30)
+    };
+
+    private readonly AppSettingsService _settingsService = new();
+    private readonly LocalizationService _localizationService = new();
+    private IRecommendationInfoService _recommendationService = DefaultRecommendationService;
+    private ICalculatorDataService _calculatorDataService = DefaultCalculatorService;
+
+    private string _languageCode = "zh-CN";
+    private string _fromCurrency = "USD";
+    private string _toCurrency = "CNY";
+    private string _inputText = "100";
+    private decimal _currentRate = 0m;
+    private CancellationTokenSource? _refreshCts;
+    private double _currentCellSize = 48d;
+    private bool _isAttached;
+    private bool _isRefreshing;
+
+    public ExchangeRateCalculatorWidget()
+    {
+        InitializeComponent();
+
+        FromCurrencyCodeTextBlock.FontFamily = MiSansFontFamily;
+        FromCurrencyNameTextBlock.FontFamily = MiSansFontFamily;
+        ToCurrencyCodeTextBlock.FontFamily = MiSansFontFamily;
+        ToCurrencyNameTextBlock.FontFamily = MiSansFontFamily;
+        InputAmountTextBlock.FontFamily = MiSansFontFamily;
+        ConvertedAmountTextBlock.FontFamily = MiSansFontFamily;
+        RateTextBlock.FontFamily = MiSansFontFamily;
+        StatusTextBlock.FontFamily = MiSansFontFamily;
+
+        AttachedToVisualTree += OnAttachedToVisualTree;
+        DetachedFromVisualTree += OnDetachedFromVisualTree;
+        SizeChanged += OnSizeChanged;
+        _refreshTimer.Tick += OnRefreshTimerTick;
+
+        ApplyCellSize(_currentCellSize);
+        UpdateLanguageCode();
+        UpdateCurrencyLabels();
+        UpdateAmounts();
+        ApplyLoadingState();
+    }
+
+    public void ApplyCellSize(double cellSize)
+    {
+        _currentCellSize = Math.Max(1, cellSize);
+        var scale = ResolveScale();
+        RootBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * scale, 14, 48));
+        RootBorder.Padding = new Thickness(Math.Clamp(12 * scale, 6, 18));
+    }
+
+    public void SetRecommendationInfoService(IRecommendationInfoService recommendationInfoService)
+    {
+        _recommendationService = recommendationInfoService ?? DefaultRecommendationService;
+        if (_isAttached)
+        {
+            _ = RefreshExchangeRateAsync(forceRefresh: false);
+        }
+    }
+
+    public void SetCalculatorDataService(ICalculatorDataService calculatorDataService)
+    {
+        _calculatorDataService = calculatorDataService ?? DefaultCalculatorService;
+        UpdateAmounts();
+    }
+
+    private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = true;
+        _refreshTimer.Start();
+        _ = RefreshExchangeRateAsync(forceRefresh: false);
+    }
+
+    private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = false;
+        _refreshTimer.Stop();
+        CancelRefreshRequest();
+    }
+
+    private void OnSizeChanged(object? sender, SizeChangedEventArgs e)
+    {
+        ApplyCellSize(_currentCellSize);
+    }
+
+    private async void OnRefreshTimerTick(object? sender, EventArgs e)
+    {
+        await RefreshExchangeRateAsync(forceRefresh: false);
+    }
+
+    private async void OnSwapCurrencyButtonClick(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+    {
+        _ = sender;
+        var from = _fromCurrency;
+        _fromCurrency = _toCurrency;
+        _toCurrency = from;
+        UpdateCurrencyLabels();
+        await RefreshExchangeRateAsync(forceRefresh: false);
+    }
+
+    private async void OnFromCurrencyRowPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        _ = sender;
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            return;
+        }
+
+        _fromCurrency = GetNextCurrencyCode(_fromCurrency, _toCurrency);
+        UpdateCurrencyLabels();
+        await RefreshExchangeRateAsync(forceRefresh: false);
+        e.Handled = true;
+    }
+
+    private async void OnToCurrencyRowPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        _ = sender;
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            return;
+        }
+
+        _toCurrency = GetNextCurrencyCode(_toCurrency, _fromCurrency);
+        UpdateCurrencyLabels();
+        await RefreshExchangeRateAsync(forceRefresh: false);
+        e.Handled = true;
+    }
+
+    private void OnInputButtonClick(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+    {
+        if (sender is not Button button || button.Tag is null)
+        {
+            return;
+        }
+
+        var token = button.Tag.ToString() ?? string.Empty;
+        _inputText = _calculatorDataService.ApplyInputToken(_inputText, token);
+        UpdateAmounts();
+        e.Handled = true;
+    }
+
+    private async Task RefreshExchangeRateAsync(bool forceRefresh)
+    {
+        if (!_isAttached || _isRefreshing)
+        {
+            return;
+        }
+
+        _isRefreshing = true;
+        UpdateLanguageCode();
+
+        var cts = new CancellationTokenSource();
+        var previous = Interlocked.Exchange(ref _refreshCts, cts);
+        previous?.Cancel();
+        previous?.Dispose();
+
+        try
+        {
+            var query = new ExchangeRateQuery(
+                BaseCurrency: _fromCurrency,
+                TargetCurrency: _toCurrency,
+                ForceRefresh: forceRefresh);
+            var result = await _recommendationService.GetExchangeRateAsync(query, cts.Token);
+            if (!_isAttached || cts.IsCancellationRequested)
+            {
+                return;
+            }
+
+            if (!result.Success || result.Data is null)
+            {
+                ApplyFailedState();
+                return;
+            }
+
+            _currentRate = result.Data.Rate;
+            StatusTextBlock.IsVisible = false;
+            UpdateAmounts();
+        }
+        catch (OperationCanceledException)
+        {
+            // Ignore canceled requests.
+        }
+        catch
+        {
+            if (_isAttached && !cts.IsCancellationRequested)
+            {
+                ApplyFailedState();
+            }
+        }
+        finally
+        {
+            if (ReferenceEquals(_refreshCts, cts))
+            {
+                _refreshCts = null;
+            }
+
+            cts.Dispose();
+            _isRefreshing = false;
+        }
+    }
+
+    private void UpdateCurrencyLabels()
+    {
+        var from = ResolveCurrency(_fromCurrency);
+        var to = ResolveCurrency(_toCurrency);
+
+        FromCurrencyCodeTextBlock.Text = from.Code;
+        FromCurrencyNameTextBlock.Text = IsZh() ? from.ZhName : from.EnName;
+        ToCurrencyCodeTextBlock.Text = to.Code;
+        ToCurrencyNameTextBlock.Text = IsZh() ? to.ZhName : to.EnName;
+    }
+
+    private void UpdateAmounts()
+    {
+        var amount = _calculatorDataService.ParseAmountOrZero(_inputText);
+        var converted = amount * Math.Max(0m, _currentRate);
+
+        InputAmountTextBlock.Text = _inputText;
+        ConvertedAmountTextBlock.Text = _calculatorDataService.FormatAmount(converted, maxFractionDigits: 4);
+        RateTextBlock.Text = string.Format(
+            CultureInfo.InvariantCulture,
+            "1 {0} = {1} {2}",
+            _fromCurrency,
+            _calculatorDataService.FormatAmount(_currentRate, maxFractionDigits: 6),
+            _toCurrency);
+    }
+
+    private void ApplyLoadingState()
+    {
+        StatusTextBlock.Text = L("exchange.widget.loading", "正在加载汇率...");
+        StatusTextBlock.IsVisible = true;
+    }
+
+    private void ApplyFailedState()
+    {
+        StatusTextBlock.Text = L("exchange.widget.fetch_failed", "汇率获取失败");
+        StatusTextBlock.IsVisible = true;
+        UpdateAmounts();
+    }
+
+    private void UpdateLanguageCode()
+    {
+        try
+        {
+            var snapshot = _settingsService.Load();
+            _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+        }
+        catch
+        {
+            _languageCode = "zh-CN";
+        }
+    }
+
+    private string GetNextCurrencyCode(string current, string avoid)
+    {
+        var currentIndex = Array.FindIndex(
+            CurrencyItems,
+            item => string.Equals(item.Code, current, StringComparison.OrdinalIgnoreCase));
+        if (currentIndex < 0)
+        {
+            currentIndex = 0;
+        }
+
+        for (var step = 1; step <= CurrencyItems.Length; step++)
+        {
+            var next = CurrencyItems[(currentIndex + step) % CurrencyItems.Length].Code;
+            if (!string.Equals(next, avoid, StringComparison.OrdinalIgnoreCase))
+            {
+                return next;
+            }
+        }
+
+        return current;
+    }
+
+    private static CurrencyItem ResolveCurrency(string code)
+    {
+        return CurrencyItems.FirstOrDefault(item =>
+            string.Equals(item.Code, code, StringComparison.OrdinalIgnoreCase))
+            ?? CurrencyItems[0];
+    }
+
+    private bool IsZh()
+    {
+        return string.Equals(_languageCode, "zh-CN", StringComparison.OrdinalIgnoreCase);
+    }
+
+    private string L(string key, string fallback)
+    {
+        return _localizationService.GetString(_languageCode, key, fallback);
+    }
+
+    private double ResolveScale()
+    {
+        var cellScale = Math.Clamp(_currentCellSize / 48d, 0.72, 1.8);
+        var widthScale = Bounds.Width > 1 ? Math.Clamp(Bounds.Width / 304d, 0.72, 2.0) : 1;
+        var heightScale = Bounds.Height > 1 ? Math.Clamp(Bounds.Height / 304d, 0.72, 2.0) : 1;
+        return Math.Clamp(Math.Min(cellScale, Math.Min(widthScale, heightScale)), 0.72, 1.95);
+    }
+
+    private void CancelRefreshRequest()
+    {
+        var cts = Interlocked.Exchange(ref _refreshCts, null);
+        if (cts is null)
+        {
+            return;
+        }
+
+        cts.Cancel();
+        cts.Dispose();
+    }
+}

LanMountainDesktop/Views/Components/IDesktopComponentWidget.cs

@@ -23,6 +23,11 @@ public interface IRecommendationInfoAwareComponentWidget
     void SetRecommendationInfoService(IRecommendationInfoService recommendationInfoService);
 }
 
+public interface ICalculatorInfoAwareComponentWidget
+{
+    void SetCalculatorDataService(ICalculatorDataService calculatorDataService);
+}
+
 public interface IDesktopPageVisibilityAwareComponentWidget
 {
     void SetDesktopPageContext(bool isOnActivePage, bool isEditMode);

LanMountainDesktop/Views/MainWindow.ComponentSystem.cs

@@ -725,9 +725,16 @@ public partial class MainWindow
             return;
         }
 
+        if (placement.ComponentId == BuiltInComponentIds.DesktopCnrDailyNews)
+        {
+            OpenCnrDailyNewsComponentSettings();
+            return;
+        }
+
         if (placement.ComponentId == BuiltInComponentIds.DesktopStudyEnvironment)
         {
             OpenStudyEnvironmentComponentSettings();
+            return;
         }
     }
 
@@ -827,6 +834,22 @@ public partial class MainWindow
         ComponentSettingsWindow.Opacity = 1;
     }
 
+    private void OpenCnrDailyNewsComponentSettings()
+    {
+        if (ComponentSettingsWindow is null || ComponentSettingsContentHost is null)
+        {
+            return;
+        }
+
+        var settingsContent = new CnrDailyNewsSettingsWindow();
+        settingsContent.SettingsChanged += OnCnrDailyNewsSettingsChanged;
+        ComponentSettingsContentHost.Content = settingsContent;
+
+        ComponentSettingsWindow.IsVisible = true;
+        ComponentSettingsWindow.Opacity = 0;
+        ComponentSettingsWindow.Opacity = 1;
+    }
+
     private void OnClassScheduleSettingsChanged(object? sender, EventArgs e)
     {
         if (_selectedDesktopComponentHost is null)
@@ -931,6 +954,30 @@ public partial class MainWindow
         PersistSettings();
     }
 
+    private void OnCnrDailyNewsSettingsChanged(object? sender, EventArgs e)
+    {
+        _ = sender;
+        _ = e;
+
+        foreach (var pageGrid in _desktopPageComponentGrids.Values)
+        {
+            foreach (var host in pageGrid.Children.OfType<Border>())
+            {
+                if (!host.Classes.Contains(DesktopComponentHostClass))
+                {
+                    continue;
+                }
+
+                if (TryGetContentHost(host)?.Child is CnrDailyNewsWidget widget)
+                {
+                    widget.RefreshFromSettings();
+                }
+            }
+        }
+
+        PersistSettings();
+    }
+
     private void CloseComponentSettingsWindow()
     {
         if (ComponentSettingsWindow is null)
@@ -963,6 +1010,11 @@ public partial class MainWindow
             worldClockSettingsWindow.SettingsChanged -= OnWorldClockSettingsChanged;
         }
 
+        if (ComponentSettingsContentHost?.Content is CnrDailyNewsSettingsWindow cnrDailyNewsSettingsWindow)
+        {
+            cnrDailyNewsSettingsWindow.SettingsChanged -= OnCnrDailyNewsSettingsChanged;
+        }
+
         ComponentSettingsWindow.Opacity = 0;
         
         DispatcherTimer.RunOnce(() =>
@@ -1366,6 +1418,30 @@ public partial class MainWindow
                 new ComponentScaleRule(WidthUnit: 2, HeightUnit: 1, MinScale: 2));
         }
 
+        if (string.Equals(componentId, BuiltInComponentIds.DesktopCnrDailyNews, StringComparison.OrdinalIgnoreCase))
+        {
+            // Keep CNR widget at a 2:1 ratio: 4x2, 6x3, 8x4...
+            return SnapSpanToScaleRules(
+                span,
+                new ComponentScaleRule(WidthUnit: 2, HeightUnit: 1, MinScale: 2));
+        }
+
+        if (string.Equals(componentId, BuiltInComponentIds.DesktopBilibiliHotSearch, StringComparison.OrdinalIgnoreCase))
+        {
+            // Keep Bilibili hot search widget at a 2:1 ratio: 4x2, 6x3, 8x4...
+            return SnapSpanToScaleRules(
+                span,
+                new ComponentScaleRule(WidthUnit: 2, HeightUnit: 1, MinScale: 2));
+        }
+
+        if (string.Equals(componentId, BuiltInComponentIds.DesktopExchangeRateCalculator, StringComparison.OrdinalIgnoreCase))
+        {
+            // Keep exchange rate converter square with minimum size 4x4.
+            return SnapSpanToScaleRules(
+                span,
+                new ComponentScaleRule(WidthUnit: 1, HeightUnit: 1, MinScale: 4));
+        }
+
         if (string.Equals(componentId, BuiltInComponentIds.DesktopStudyNoiseCurve, StringComparison.OrdinalIgnoreCase))
         {
             // Keep noise curve widget in a 2:1 ratio with minimum 4x2.
@@ -1603,7 +1679,8 @@ public partial class MainWindow
             _currentDesktopCellSize,
             _timeZoneService,
             _weatherDataService,
-            _recommendationInfoService);
+            _recommendationInfoService,
+            _calculatorDataService);
         component.Classes.Add(DesktopComponentClass);
         return component;
     }
@@ -2529,6 +2606,11 @@ public partial class MainWindow
             return Symbol.Apps;
         }
 
+        if (string.Equals(categoryId, "Calculator", StringComparison.OrdinalIgnoreCase))
+        {
+            return Symbol.Calculator;
+        }
+
         if (string.Equals(categoryId, "Study", StringComparison.OrdinalIgnoreCase))
         {
             return Symbol.Apps;
@@ -2569,6 +2651,11 @@ public partial class MainWindow
             return L("component_category.info", "Info");
         }
 
+        if (string.Equals(categoryId, "Calculator", StringComparison.OrdinalIgnoreCase))
+        {
+            return L("component_category.calculator", "Calculator");
+        }
+
         if (string.Equals(categoryId, "Study", StringComparison.OrdinalIgnoreCase))
         {
             return L("component_category.study", "Study");
@@ -2737,7 +2824,8 @@ public partial class MainWindow
                 renderCellSize,
                 _timeZoneService,
                 _weatherDataService,
-                _recommendationInfoService);
+                _recommendationInfoService,
+                _calculatorDataService);
 
             var previewSurface = new Border
             {

LanMountainDesktop/Views/MainWindow.Localization.cs

@@ -110,6 +110,7 @@ public partial class MainWindow
         SettingsNavStatusBarTextBlock.Text = L("settings.nav.status_bar", "Status Bar");
         SettingsNavWeatherTextBlock.Text = L("settings.nav.weather", "Weather");
         SettingsNavRegionTextBlock.Text = L("settings.nav.region", "Region");
+        SettingsNavUpdateTextBlock.Text = L("settings.nav.update", "Update");
 
         WallpaperPanelTitleTextBlock.Text = L("settings.wallpaper.title", "Personalize your wallpaper");
         WallpaperPlacementSettingsExpander.Header = L("settings.wallpaper.placement_label", "Placement");
@@ -248,6 +249,8 @@ public partial class MainWindow
             "settings.region.timezone_desc",
             "Select a time zone. Clock and calendar widgets will follow this zone.");
 
+        ApplyUpdateLocalization();
+
         SettingsNavAboutTextBlock.Text = L("settings.nav.about", "About");
         AboutPanelTitleTextBlock.Text = L("settings.about.title", "About");
         VersionTextBlock.Text = Lf(

LanMountainDesktop/Views/MainWindow.Settings.cs

@@ -8,6 +8,7 @@ using System.Globalization;
 using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
+using System.Threading;
 using System.Threading.Tasks;
 using Avalonia;
 using Avalonia.Controls;
@@ -64,6 +65,7 @@ public partial class MainWindow
             StatusBarSettingsPanel is null ||
             WeatherSettingsPanel is null ||
             RegionSettingsPanel is null ||
+            UpdateSettingsPanel is null ||
             AboutSettingsPanel is null)
         {
             return;
@@ -76,7 +78,8 @@ public partial class MainWindow
         StatusBarSettingsPanel.IsVisible = selectedIndex == 3;
         WeatherSettingsPanel.IsVisible = selectedIndex == 4;
         RegionSettingsPanel.IsVisible = selectedIndex == 5;
-        AboutSettingsPanel.IsVisible = selectedIndex == 6;
+        UpdateSettingsPanel.IsVisible = selectedIndex == 6;
+        AboutSettingsPanel.IsVisible = selectedIndex == 7;
 
         if (selectedIndex == 1)
         {
@@ -547,10 +550,12 @@ public partial class MainWindow
         Core.Initialize();
         _libVlc ??= new LibVLC("--quiet");
 
-        if (_videoWallpaperPlayer is null && DesktopVideoWallpaperView is not null)
+        if (_videoWallpaperPlayer is null)
         {
-            _videoWallpaperPlayer = new MediaPlayer(_libVlc);
-            DesktopVideoWallpaperView.MediaPlayer = _videoWallpaperPlayer;
+            _videoWallpaperPlayer = new MediaPlayer(_libVlc)
+            {
+                EnableHardwareDecoding = false
+            };
         }
 
         if (_previewVideoWallpaperPlayer is null && WallpaperPreviewVideoView is not null)
@@ -560,6 +565,212 @@ public partial class MainWindow
         }
     }
 
+    private bool ConfigureDesktopVideoRenderer()
+    {
+        if (_videoWallpaperPlayer is null || DesktopVideoWallpaperImage is null)
+        {
+            return false;
+        }
+
+        var (targetWidth, targetHeight) = GetDesktopVideoRenderSize();
+        var targetPitch = targetWidth * 4;
+        var targetBufferSize = targetPitch * targetHeight;
+        if (targetBufferSize <= 0)
+        {
+            return false;
+        }
+
+        if (targetWidth == _desktopVideoFrameWidth &&
+            targetHeight == _desktopVideoFrameHeight &&
+            _desktopVideoFrameBufferPtr != IntPtr.Zero &&
+            _desktopVideoBitmap is not null)
+        {
+            return true;
+        }
+
+        ReleaseDesktopVideoRendererResources();
+
+        try
+        {
+            _desktopVideoFrameWidth = targetWidth;
+            _desktopVideoFrameHeight = targetHeight;
+            _desktopVideoFramePitch = targetPitch;
+            _desktopVideoFrameBufferSize = targetBufferSize;
+            _desktopVideoFrameBufferPtr = Marshal.AllocHGlobal(_desktopVideoFrameBufferSize);
+            _desktopVideoStagingBuffer = new byte[_desktopVideoFrameBufferSize];
+            _desktopVideoBitmap = new WriteableBitmap(
+                new PixelSize(_desktopVideoFrameWidth, _desktopVideoFrameHeight),
+                new Vector(96, 96),
+                PixelFormat.Bgra8888,
+                AlphaFormat.Opaque);
+            EnsureDesktopVideoCallbacks();
+            _videoWallpaperPlayer.SetVideoCallbacks(
+                _desktopVideoLockCallback!,
+                _desktopVideoUnlockCallback!,
+                _desktopVideoDisplayCallback!);
+            _videoWallpaperPlayer.SetVideoFormat(
+                "RV32",
+                (uint)_desktopVideoFrameWidth,
+                (uint)_desktopVideoFrameHeight,
+                (uint)_desktopVideoFramePitch);
+            DesktopVideoWallpaperImage.Source = _desktopVideoBitmap;
+            return true;
+        }
+        catch
+        {
+            ReleaseDesktopVideoRendererResources();
+            return false;
+        }
+    }
+
+    private (int Width, int Height) GetDesktopVideoRenderSize()
+    {
+        var hostWidth = DesktopHost?.Bounds.Width ?? Bounds.Width;
+        var hostHeight = DesktopHost?.Bounds.Height ?? Bounds.Height;
+        var pixelWidth = Math.Max(1, (int)Math.Round(hostWidth * RenderScaling));
+        var pixelHeight = Math.Max(1, (int)Math.Round(hostHeight * RenderScaling));
+
+        const int maxPixelCount = 1920 * 1080;
+        var pixelCount = (long)pixelWidth * pixelHeight;
+        if (pixelCount > maxPixelCount)
+        {
+            var scale = Math.Sqrt((double)maxPixelCount / pixelCount);
+            pixelWidth = Math.Max(1, (int)Math.Round(pixelWidth * scale));
+            pixelHeight = Math.Max(1, (int)Math.Round(pixelHeight * scale));
+        }
+
+        return (pixelWidth, pixelHeight);
+    }
+
+    private void EnsureDesktopVideoCallbacks()
+    {
+        _desktopVideoLockCallback ??= OnDesktopVideoFrameLock;
+        _desktopVideoUnlockCallback ??= OnDesktopVideoFrameUnlock;
+        _desktopVideoDisplayCallback ??= OnDesktopVideoFrameDisplay;
+    }
+
+    private IntPtr OnDesktopVideoFrameLock(IntPtr opaque, IntPtr planes)
+    {
+        Monitor.Enter(_desktopVideoFrameSync);
+        if (_desktopVideoFrameBufferPtr == IntPtr.Zero)
+        {
+            Marshal.WriteIntPtr(planes, IntPtr.Zero);
+            Monitor.Exit(_desktopVideoFrameSync);
+            return IntPtr.Zero;
+        }
+
+        Marshal.WriteIntPtr(planes, _desktopVideoFrameBufferPtr);
+        return IntPtr.Zero;
+    }
+
+    private void OnDesktopVideoFrameUnlock(IntPtr opaque, IntPtr picture, IntPtr planes)
+    {
+        if (Monitor.IsEntered(_desktopVideoFrameSync))
+        {
+            Monitor.Exit(_desktopVideoFrameSync);
+        }
+    }
+
+    private void OnDesktopVideoFrameDisplay(IntPtr opaque, IntPtr picture)
+    {
+        Interlocked.Exchange(ref _desktopVideoFrameDirtyFlag, 1);
+        ScheduleDesktopVideoFrameUiRefresh();
+    }
+
+    private void ScheduleDesktopVideoFrameUiRefresh()
+    {
+        if (Interlocked.Exchange(ref _desktopVideoFrameUiRefreshScheduledFlag, 1) == 1)
+        {
+            return;
+        }
+
+        Dispatcher.UIThread.Post(() =>
+        {
+            try
+            {
+                PushDesktopVideoFrameToWallpaperImage();
+            }
+            finally
+            {
+                Interlocked.Exchange(ref _desktopVideoFrameUiRefreshScheduledFlag, 0);
+                if (Volatile.Read(ref _desktopVideoFrameDirtyFlag) == 1)
+                {
+                    ScheduleDesktopVideoFrameUiRefresh();
+                }
+            }
+        }, DispatcherPriority.Render);
+    }
+
+    private void PushDesktopVideoFrameToWallpaperImage()
+    {
+        if (Interlocked.Exchange(ref _desktopVideoFrameDirtyFlag, 0) == 0)
+        {
+            return;
+        }
+
+        if (_desktopVideoBitmap is null ||
+            _desktopVideoStagingBuffer is null ||
+            _desktopVideoFrameBufferPtr == IntPtr.Zero ||
+            _desktopVideoFrameBufferSize <= 0)
+        {
+            return;
+        }
+
+        lock (_desktopVideoFrameSync)
+        {
+            if (_desktopVideoFrameBufferPtr == IntPtr.Zero)
+            {
+                return;
+            }
+
+            Marshal.Copy(_desktopVideoFrameBufferPtr, _desktopVideoStagingBuffer, 0, _desktopVideoFrameBufferSize);
+        }
+
+        using var framebuffer = _desktopVideoBitmap.Lock();
+        var rows = Math.Min(framebuffer.Size.Height, _desktopVideoFrameHeight);
+        var bytesPerRow = Math.Min(framebuffer.RowBytes, _desktopVideoFramePitch);
+        for (var row = 0; row < rows; row++)
+        {
+            var sourceOffset = row * _desktopVideoFramePitch;
+            var destinationPtr = IntPtr.Add(framebuffer.Address, row * framebuffer.RowBytes);
+            Marshal.Copy(_desktopVideoStagingBuffer, sourceOffset, destinationPtr, bytesPerRow);
+        }
+
+        if (DesktopVideoWallpaperImage is not null &&
+            !ReferenceEquals(DesktopVideoWallpaperImage.Source, _desktopVideoBitmap))
+        {
+            DesktopVideoWallpaperImage.Source = _desktopVideoBitmap;
+        }
+    }
+
+    private void ReleaseDesktopVideoRendererResources()
+    {
+        Interlocked.Exchange(ref _desktopVideoFrameDirtyFlag, 0);
+        Interlocked.Exchange(ref _desktopVideoFrameUiRefreshScheduledFlag, 0);
+
+        if (DesktopVideoWallpaperImage is not null)
+        {
+            DesktopVideoWallpaperImage.Source = null;
+        }
+
+        _desktopVideoBitmap?.Dispose();
+        _desktopVideoBitmap = null;
+        _desktopVideoStagingBuffer = null;
+        _desktopVideoFrameWidth = 0;
+        _desktopVideoFrameHeight = 0;
+        _desktopVideoFramePitch = 0;
+        _desktopVideoFrameBufferSize = 0;
+
+        lock (_desktopVideoFrameSync)
+        {
+            if (_desktopVideoFrameBufferPtr != IntPtr.Zero)
+            {
+                Marshal.FreeHGlobal(_desktopVideoFrameBufferPtr);
+                _desktopVideoFrameBufferPtr = IntPtr.Zero;
+            }
+        }
+    }
+
     private void PlayVideoWallpaper(string videoPath)
     {
         if (!File.Exists(videoPath))
@@ -575,7 +786,7 @@ public partial class MainWindow
             if (_videoWallpaperPlayer is null ||
                 _previewVideoWallpaperPlayer is null ||
                 _libVlc is null ||
-                DesktopVideoWallpaperView is null ||
+                DesktopVideoWallpaperImage is null ||
                 WallpaperPreviewVideoView is null)
             {
                 _wallpaperStatus = L("settings.wallpaper.video_player_unavailable", "Video player is unavailable.");
@@ -583,6 +794,13 @@ public partial class MainWindow
                 return;
             }
 
+            if (!ConfigureDesktopVideoRenderer())
+            {
+                _wallpaperStatus = L("settings.wallpaper.video_player_unavailable", "Video player is unavailable.");
+                StopVideoWallpaper();
+                return;
+            }
+
             _videoWallpaperMedia?.Dispose();
             _previewVideoWallpaperMedia?.Dispose();
             _videoWallpaperMedia = new Media(_libVlc, new Uri(videoPath));
@@ -591,7 +809,7 @@ public partial class MainWindow
             _previewVideoWallpaperMedia.AddOption(":input-repeat=65535");
             _videoWallpaperPlayer.Play(_videoWallpaperMedia);
             _previewVideoWallpaperPlayer.Play(_previewVideoWallpaperMedia);
-            DesktopVideoWallpaperView.IsVisible = true;
+            DesktopVideoWallpaperImage.IsVisible = true;
             WallpaperPreviewVideoView.IsVisible = true;
         }
         catch (Exception ex)
@@ -603,9 +821,9 @@ public partial class MainWindow
 
     private void StopVideoWallpaper()
     {
-        if (DesktopVideoWallpaperView is not null)
+        if (DesktopVideoWallpaperImage is not null)
         {
-            DesktopVideoWallpaperView.IsVisible = false;
+            DesktopVideoWallpaperImage.IsVisible = false;
         }
 
         if (WallpaperPreviewVideoView is not null)
@@ -613,16 +831,17 @@ public partial class MainWindow
             WallpaperPreviewVideoView.IsVisible = false;
         }
 
-        if (_videoWallpaperPlayer?.IsPlaying == true)
+        if (_videoWallpaperPlayer is not null)
         {
             _videoWallpaperPlayer.Stop();
         }
 
-        if (_previewVideoWallpaperPlayer?.IsPlaying == true)
+        if (_previewVideoWallpaperPlayer is not null)
         {
             _previewVideoWallpaperPlayer.Stop();
         }
 
+        ReleaseDesktopVideoRendererResources();
         _videoWallpaperMedia?.Dispose();
         _videoWallpaperMedia = null;
         _previewVideoWallpaperMedia?.Dispose();
@@ -660,6 +879,9 @@ public partial class MainWindow
             WeatherNoTlsRequests = _weatherNoTlsRequests,
             DailyArtworkMirrorSource = DailyArtworkMirrorSources.Normalize(_dailyArtworkMirrorSource),
             AutoStartWithWindows = _autoStartWithWindows,
+            AutoCheckUpdates = _autoCheckUpdates,
+            IncludePrereleaseUpdates = IncludePrereleaseUpdates,
+            UpdateChannel = IncludePrereleaseUpdates ? "Preview" : "Stable",
             TopStatusComponentIds = _topStatusComponentIds.ToList(),
             PinnedTaskbarActions = _pinnedTaskbarActions.Select(action => action.ToString()).ToList(),
             EnableDynamicTaskbarActions = _enableDynamicTaskbarActions,
@@ -2012,6 +2234,24 @@ public partial class MainWindow
             };
         }
 
+        if (UpdateOptionsSettingsExpander is not null)
+        {
+            UpdateOptionsSettingsExpander.IconSource = new FluentIcons.Avalonia.Fluent.SymbolIconSource
+            {
+                Symbol = Symbol.ArrowClockwiseDashesSettings,
+                IconVariant = variant
+            };
+        }
+
+        if (UpdateActionsSettingsExpander is not null)
+        {
+            UpdateActionsSettingsExpander.IconSource = new FluentIcons.Avalonia.Fluent.SymbolIconSource
+            {
+                Symbol = Symbol.ArrowDownload,
+                IconVariant = variant
+            };
+        }
+
         if (AboutStartupSettingsExpander is not null)
         {
             AboutStartupSettingsExpander.IconSource = new FluentIcons.Avalonia.Fluent.SymbolIconSource

LanMountainDesktop/Views/MainWindow.Update.cs

@@ -0,0 +1,482 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Threading.Tasks;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Threading;
+using LanMountainDesktop.Models;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views;
+
+public partial class MainWindow
+{
+    private const string UpdateChannelStable = "Stable";
+    private const string UpdateChannelPreview = "Preview";
+
+    private bool _autoCheckUpdates = true;
+    private string _updateChannel = UpdateChannelStable;
+    private bool _suppressUpdateOptionEvents;
+    private bool _isCheckingUpdates;
+    private bool _isDownloadingUpdate;
+    private string _latestReleaseVersionText = "-";
+    private DateTimeOffset? _latestReleasePublishedAt;
+    private string _updateStatusText = string.Empty;
+    private string _updateDownloadProgressText = string.Empty;
+    private double _updateDownloadProgressPercent;
+    private GitHubReleaseAsset? _latestReleaseInstallerAsset;
+    private string? _downloadedUpdateInstallerPath;
+
+    private bool IncludePrereleaseUpdates => string.Equals(
+        _updateChannel,
+        UpdateChannelPreview,
+        StringComparison.OrdinalIgnoreCase);
+
+    private void InitializeUpdateSettings(AppSettingsSnapshot snapshot)
+    {
+        _autoCheckUpdates = snapshot.AutoCheckUpdates;
+        _updateChannel = NormalizeUpdateChannel(snapshot.UpdateChannel, snapshot.IncludePrereleaseUpdates);
+        _latestReleaseVersionText = "-";
+        _latestReleasePublishedAt = null;
+        _updateDownloadProgressPercent = 0;
+        _updateDownloadProgressText = L("settings.update.download_progress_idle", "Download progress: -");
+        _updateStatusText = L("settings.update.status_ready", "Ready to check for updates.");
+        _latestReleaseInstallerAsset = null;
+        _downloadedUpdateInstallerPath = null;
+
+        _suppressUpdateOptionEvents = true;
+        try
+        {
+            if (AutoCheckUpdatesToggleSwitch is not null)
+            {
+                AutoCheckUpdatesToggleSwitch.IsChecked = _autoCheckUpdates;
+            }
+
+            if (UpdateChannelChipListBox is not null)
+            {
+                UpdateChannelChipListBox.SelectedIndex = IncludePrereleaseUpdates ? 1 : 0;
+            }
+        }
+        finally
+        {
+            _suppressUpdateOptionEvents = false;
+        }
+
+        UpdateUpdatePanelState();
+    }
+
+    private void TriggerAutoUpdateCheckIfEnabled()
+    {
+        if (!_autoCheckUpdates)
+        {
+            return;
+        }
+
+        _ = CheckForUpdatesAsync(silentWhenNoUpdate: true);
+    }
+
+    private void ApplyUpdateLocalization()
+    {
+        SettingsNavUpdateTextBlock.Text = L("settings.nav.update", "Update");
+        UpdatePanelTitleTextBlock.Text = L("settings.update.title", "Update");
+
+        UpdateCurrentVersionLabelTextBlock.Text = L("settings.update.current_version_label", "Current Version");
+        UpdateLatestVersionLabelTextBlock.Text = L("settings.update.latest_version_label", "Latest Release");
+        UpdatePublishedAtLabelTextBlock.Text = L("settings.update.published_at_label", "Published At");
+
+        UpdateOptionsSettingsExpander.Header = L("settings.update.options_header", "Update Options");
+        UpdateOptionsSettingsExpander.Description = L(
+            "settings.update.options_desc",
+            "Configure update checks and release channel.");
+
+        AutoCheckUpdatesToggleSwitch.Content = L(
+            "settings.update.auto_check_toggle",
+            "Automatically check for updates on startup");
+        UpdateChannelLabelTextBlock.Text = L(
+            "settings.update.channel_label",
+            "Update Channel");
+        UpdateChannelStableChipItem.Content = L(
+            "settings.update.channel_stable",
+            "Stable");
+        UpdateChannelPreviewChipItem.Content = L(
+            "settings.update.channel_preview",
+            "Preview");
+
+        UpdateActionsSettingsExpander.Header = L("settings.update.actions_header", "Update Actions");
+        UpdateActionsSettingsExpander.Description = L(
+            "settings.update.actions_desc",
+            "Check releases, download installer, and start update.");
+
+        CheckForUpdatesButton.Content = L("settings.update.check_button", "Check for Updates");
+        DownloadAndInstallUpdateButton.Content = L("settings.update.download_install_button", "Download & Install");
+
+        if (string.IsNullOrWhiteSpace(_updateDownloadProgressText))
+        {
+            _updateDownloadProgressText = L("settings.update.download_progress_idle", "Download progress: -");
+        }
+
+        if (string.IsNullOrWhiteSpace(_updateStatusText))
+        {
+            _updateStatusText = L("settings.update.status_ready", "Ready to check for updates.");
+        }
+
+        UpdateUpdatePanelState();
+    }
+
+    private async void OnCheckForUpdatesClick(object? sender, RoutedEventArgs e)
+    {
+        await CheckForUpdatesAsync(silentWhenNoUpdate: false);
+    }
+
+    private async void OnDownloadAndInstallUpdateClick(object? sender, RoutedEventArgs e)
+    {
+        if (_isCheckingUpdates || _isDownloadingUpdate)
+        {
+            return;
+        }
+
+        if (_latestReleaseInstallerAsset is null)
+        {
+            await CheckForUpdatesAsync(silentWhenNoUpdate: false);
+        }
+
+        if (_latestReleaseInstallerAsset is null)
+        {
+            return;
+        }
+
+        await DownloadAndInstallUpdateAsync(_latestReleaseInstallerAsset);
+    }
+
+    private void OnAutoCheckUpdatesToggled(object? sender, RoutedEventArgs e)
+    {
+        if (_suppressUpdateOptionEvents || AutoCheckUpdatesToggleSwitch is null)
+        {
+            return;
+        }
+
+        _autoCheckUpdates = AutoCheckUpdatesToggleSwitch.IsChecked == true;
+        PersistSettings();
+    }
+
+    private void OnUpdateChannelSelectionChanged(object? sender, SelectionChangedEventArgs e)
+    {
+        if (_suppressUpdateOptionEvents || UpdateChannelChipListBox is null)
+        {
+            return;
+        }
+
+        var selectedChannel = UpdateChannelChipListBox.SelectedIndex == 1
+            ? UpdateChannelPreview
+            : UpdateChannelStable;
+
+        if (string.Equals(_updateChannel, selectedChannel, StringComparison.OrdinalIgnoreCase))
+        {
+            return;
+        }
+
+        _updateChannel = selectedChannel;
+        _latestReleaseInstallerAsset = null;
+        _latestReleaseVersionText = "-";
+        _latestReleasePublishedAt = null;
+        _downloadedUpdateInstallerPath = null;
+        _updateStatusText = Lf(
+            "settings.update.status_channel_changed_format",
+            "Update channel switched to {0}. Please check again.",
+            GetLocalizedUpdateChannelName(_updateChannel));
+        PersistSettings();
+        UpdateUpdatePanelState();
+    }
+
+    private async Task CheckForUpdatesAsync(bool silentWhenNoUpdate)
+    {
+        if (_isCheckingUpdates || _isDownloadingUpdate)
+        {
+            return;
+        }
+
+        if (!OperatingSystem.IsWindows())
+        {
+            _updateStatusText = L(
+                "settings.update.status_windows_only",
+                "Automatic installer update is currently available only on Windows.");
+            UpdateUpdatePanelState();
+            return;
+        }
+
+        _isCheckingUpdates = true;
+        _updateStatusText = L("settings.update.status_checking", "Checking GitHub releases...");
+        _updateDownloadProgressPercent = 0;
+        _updateDownloadProgressText = L("settings.update.download_progress_idle", "Download progress: -");
+        UpdateUpdatePanelState();
+
+        try
+        {
+            if (!Version.TryParse(GetAppVersionText(), out var currentVersion))
+            {
+                currentVersion = new Version(0, 0, 0);
+            }
+
+            var result = await _releaseUpdateService.CheckForUpdatesAsync(
+                currentVersion,
+                IncludePrereleaseUpdates);
+
+            if (!result.Success)
+            {
+                _latestReleaseInstallerAsset = null;
+                _latestReleaseVersionText = "-";
+                _latestReleasePublishedAt = null;
+                _downloadedUpdateInstallerPath = null;
+                _updateStatusText = Lf(
+                    "settings.update.status_check_failed_format",
+                    "Update check failed: {0}",
+                    result.ErrorMessage ?? L("common.unknown", "Unknown error"));
+                return;
+            }
+
+            _latestReleaseInstallerAsset = result.PreferredAsset;
+            _latestReleaseVersionText = result.LatestVersionText;
+            _latestReleasePublishedAt = result.Release?.PublishedAt;
+            _downloadedUpdateInstallerPath = null;
+
+            if (!result.IsUpdateAvailable)
+            {
+                _latestReleaseInstallerAsset = null;
+                _updateStatusText = silentWhenNoUpdate
+                    ? L("settings.update.status_up_to_date", "You are already on the latest version.")
+                    : L("settings.update.status_up_to_date", "You are already on the latest version.");
+                return;
+            }
+
+            if (_latestReleaseInstallerAsset is null)
+            {
+                _updateStatusText = L(
+                    "settings.update.status_asset_missing",
+                    "A new release is available, but no compatible installer was found.");
+                return;
+            }
+
+            _updateStatusText = Lf(
+                "settings.update.status_available_format",
+                "New version {0} is available. Click Download & Install.",
+                _latestReleaseVersionText);
+        }
+        catch (Exception ex)
+        {
+            _updateStatusText = Lf(
+                "settings.update.status_check_failed_format",
+                "Update check failed: {0}",
+                ex.Message);
+        }
+        finally
+        {
+            _isCheckingUpdates = false;
+            UpdateUpdatePanelState();
+        }
+    }
+
+    private async Task DownloadAndInstallUpdateAsync(GitHubReleaseAsset asset)
+    {
+        if (_isCheckingUpdates || _isDownloadingUpdate)
+        {
+            return;
+        }
+
+        _isDownloadingUpdate = true;
+        _updateStatusText = L("settings.update.status_downloading", "Downloading installer...");
+        _updateDownloadProgressPercent = 0;
+        _updateDownloadProgressText = Lf(
+            "settings.update.download_progress_format",
+            "Download progress: {0:F0}%",
+            _updateDownloadProgressPercent);
+        UpdateUpdatePanelState();
+
+        try
+        {
+            var destinationPath = BuildUpdateInstallerPath(asset.Name);
+            var progress = new Progress<double>(value =>
+            {
+                _updateDownloadProgressPercent = Math.Clamp(value * 100d, 0d, 100d);
+                _updateDownloadProgressText = Lf(
+                    "settings.update.download_progress_format",
+                    "Download progress: {0:F0}%",
+                    _updateDownloadProgressPercent);
+                UpdateUpdatePanelState();
+            });
+
+            var result = await _releaseUpdateService.DownloadAssetAsync(asset, destinationPath, progress);
+            if (!result.Success || string.IsNullOrWhiteSpace(result.FilePath))
+            {
+                _updateStatusText = Lf(
+                    "settings.update.status_download_failed_format",
+                    "Download failed: {0}",
+                    result.ErrorMessage ?? L("common.unknown", "Unknown error"));
+                return;
+            }
+
+            _downloadedUpdateInstallerPath = result.FilePath;
+            _updateDownloadProgressPercent = 100;
+            _updateDownloadProgressText = Lf(
+                "settings.update.download_progress_format",
+                "Download progress: {0:F0}%",
+                _updateDownloadProgressPercent);
+            _updateStatusText = L("settings.update.status_launching_installer", "Download complete. Launching installer...");
+            UpdateUpdatePanelState();
+
+            LaunchInstallerAndExit(_downloadedUpdateInstallerPath);
+        }
+        catch (Exception ex)
+        {
+            _updateStatusText = Lf(
+                "settings.update.status_download_failed_format",
+                "Download failed: {0}",
+                ex.Message);
+        }
+        finally
+        {
+            _isDownloadingUpdate = false;
+            UpdateUpdatePanelState();
+        }
+    }
+
+    private void LaunchInstallerAndExit(string installerPath)
+    {
+        if (string.IsNullOrWhiteSpace(installerPath) || !File.Exists(installerPath))
+        {
+            _updateStatusText = L(
+                "settings.update.status_installer_missing",
+                "Installer file was not found after download.");
+            UpdateUpdatePanelState();
+            return;
+        }
+
+        try
+        {
+            Process.Start(new ProcessStartInfo
+            {
+                FileName = installerPath,
+                WorkingDirectory = Path.GetDirectoryName(installerPath) ?? Environment.CurrentDirectory,
+                UseShellExecute = true
+            });
+
+            _updateStatusText = L(
+                "settings.update.status_installer_started",
+                "Installer started. The app will close for update.");
+            UpdateUpdatePanelState();
+
+            Dispatcher.UIThread.Post(Close, DispatcherPriority.Background);
+        }
+        catch (Exception ex)
+        {
+            _updateStatusText = Lf(
+                "settings.update.status_launch_failed_format",
+                "Failed to start installer: {0}",
+                ex.Message);
+            UpdateUpdatePanelState();
+        }
+    }
+
+    private void UpdateUpdatePanelState()
+    {
+        if (UpdateCurrentVersionValueTextBlock is not null)
+        {
+            UpdateCurrentVersionValueTextBlock.Text = GetAppVersionText();
+        }
+
+        if (UpdateLatestVersionValueTextBlock is not null)
+        {
+            UpdateLatestVersionValueTextBlock.Text = string.IsNullOrWhiteSpace(_latestReleaseVersionText)
+                ? "-"
+                : _latestReleaseVersionText;
+        }
+
+        if (UpdatePublishedAtValueTextBlock is not null)
+        {
+            UpdatePublishedAtValueTextBlock.Text = _latestReleasePublishedAt.HasValue &&
+                                                   _latestReleasePublishedAt.Value != DateTimeOffset.MinValue
+                ? _latestReleasePublishedAt.Value.LocalDateTime.ToString("yyyy-MM-dd HH:mm")
+                : "-";
+        }
+
+        if (UpdateStatusTextBlock is not null)
+        {
+            UpdateStatusTextBlock.Text = string.IsNullOrWhiteSpace(_updateStatusText)
+                ? L("settings.update.status_ready", "Ready to check for updates.")
+                : _updateStatusText;
+        }
+
+        if (UpdateDownloadProgressTextBlock is not null)
+        {
+            UpdateDownloadProgressTextBlock.Text = string.IsNullOrWhiteSpace(_updateDownloadProgressText)
+                ? L("settings.update.download_progress_idle", "Download progress: -")
+                : _updateDownloadProgressText;
+        }
+
+        if (UpdateDownloadProgressBar is not null)
+        {
+            UpdateDownloadProgressBar.IsVisible = _isDownloadingUpdate;
+            UpdateDownloadProgressBar.Value = Math.Clamp(_updateDownloadProgressPercent, 0d, 100d);
+        }
+
+        if (CheckForUpdatesButton is not null)
+        {
+            CheckForUpdatesButton.IsEnabled = !_isCheckingUpdates && !_isDownloadingUpdate;
+        }
+
+        if (DownloadAndInstallUpdateButton is not null)
+        {
+            DownloadAndInstallUpdateButton.IsEnabled = !_isCheckingUpdates &&
+                                                       !_isDownloadingUpdate &&
+                                                       _latestReleaseInstallerAsset is not null;
+        }
+    }
+
+    private static string NormalizeUpdateChannel(string? channel, bool includePrereleaseFallback)
+    {
+        if (string.Equals(channel, UpdateChannelPreview, StringComparison.OrdinalIgnoreCase))
+        {
+            return UpdateChannelPreview;
+        }
+
+        if (string.Equals(channel, UpdateChannelStable, StringComparison.OrdinalIgnoreCase))
+        {
+            return UpdateChannelStable;
+        }
+
+        return includePrereleaseFallback ? UpdateChannelPreview : UpdateChannelStable;
+    }
+
+    private string GetLocalizedUpdateChannelName(string channel)
+    {
+        return string.Equals(channel, UpdateChannelPreview, StringComparison.OrdinalIgnoreCase)
+            ? L("settings.update.channel_preview", "Preview")
+            : L("settings.update.channel_stable", "Stable");
+    }
+
+    private static string BuildUpdateInstallerPath(string assetName)
+    {
+        var appData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        var updatesDirectory = Path.Combine(appData, "LanMountainDesktop", "Updates");
+        Directory.CreateDirectory(updatesDirectory);
+
+        var safeName = SanitizeFileName(assetName);
+        return Path.Combine(updatesDirectory, safeName);
+    }
+
+    private static string SanitizeFileName(string fileName)
+    {
+        if (string.IsNullOrWhiteSpace(fileName))
+        {
+            return $"LanMountainDesktop-Update-{DateTime.Now:yyyyMMddHHmmss}.exe";
+        }
+
+        var sanitized = fileName;
+        foreach (var c in Path.GetInvalidFileNameChars())
+        {
+            sanitized = sanitized.Replace(c, '_');
+        }
+
+        return sanitized;
+    }
+}

LanMountainDesktop/Views/MainWindow.axaml

@@ -83,11 +83,12 @@
                             VerticalAlignment="Stretch"
                             Background="{DynamicResource AdaptiveSurfaceBaseBrush}" />
 
-                    <vlc:VideoView x:Name="DesktopVideoWallpaperView"
-                                   IsVisible="False"
-                                   IsHitTestVisible="False"
-                                   HorizontalAlignment="Stretch"
-                                   VerticalAlignment="Stretch" />
+                    <Image x:Name="DesktopVideoWallpaperImage"
+                           IsVisible="False"
+                           IsHitTestVisible="False"
+                           Stretch="UniformToFill"
+                           HorizontalAlignment="Stretch"
+                           VerticalAlignment="Stretch" />
 
                     <Grid x:Name="DesktopGrid"
                           HorizontalAlignment="Center"
@@ -447,6 +448,12 @@
                                             <TextBlock x:Name="SettingsNavRegionTextBlock" Text="&#22320;&#21306;" VerticalAlignment="Center" />
                                         </StackPanel>
                                     </ListBoxItem>
+                                    <ListBoxItem x:Name="SettingsNavUpdateItem" ToolTip.Tip="&#26356;&#26032;">
+                                        <StackPanel Orientation="Horizontal" Spacing="12">
+                                            <fi:SymbolIcon x:Name="SettingsNavUpdateIcon" Symbol="ArrowSync" IconVariant="Regular" />
+                                            <TextBlock x:Name="SettingsNavUpdateTextBlock" Text="&#26356;&#26032;" VerticalAlignment="Center" />
+                                        </StackPanel>
+                                    </ListBoxItem>
                                     <ListBoxItem x:Name="SettingsNavAboutItem" ToolTip.Tip="&#20851;&#20110;">
                                         <StackPanel Orientation="Horizontal" Spacing="12">
                                             <fi:SymbolIcon x:Name="SettingsNavAboutIcon" Symbol="Info" IconVariant="Regular" />
@@ -1378,6 +1385,114 @@
 </Border>
                                 </StackPanel>
 
+                                <StackPanel x:Name="UpdateSettingsPanel" IsVisible="False" Spacing="16">
+                                    <TextBlock x:Name="UpdatePanelTitleTextBlock"
+                                               FontSize="24"
+                                               FontWeight="SemiBold"
+                                               Foreground="{DynamicResource AdaptiveTextPrimaryBrush}"
+                                               Text="Update" />
+
+                                    <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}" CornerRadius="{DynamicResource DesignCornerRadiusMd}" Padding="20">
+                                        <Grid ColumnDefinitions="Auto,*" RowDefinitions="Auto,Auto,Auto" ColumnSpacing="12" RowSpacing="8">
+                                            <TextBlock x:Name="UpdateCurrentVersionLabelTextBlock"
+                                                       Text="Current Version"
+                                                       FontWeight="SemiBold"
+                                                       Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+                                            <TextBlock x:Name="UpdateCurrentVersionValueTextBlock"
+                                                       Grid.Column="1"
+                                                       Text="-"
+                                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+
+                                            <TextBlock x:Name="UpdateLatestVersionLabelTextBlock"
+                                                       Grid.Row="1"
+                                                       Text="Latest Release"
+                                                       FontWeight="SemiBold"
+                                                       Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+                                            <TextBlock x:Name="UpdateLatestVersionValueTextBlock"
+                                                       Grid.Row="1" Grid.Column="1"
+                                                       Text="-"
+                                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+
+                                            <TextBlock x:Name="UpdatePublishedAtLabelTextBlock"
+                                                       Grid.Row="2"
+                                                       Text="Published At"
+                                                       FontWeight="SemiBold"
+                                                       Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+                                            <TextBlock x:Name="UpdatePublishedAtValueTextBlock"
+                                                       Grid.Row="2" Grid.Column="1"
+                                                       Text="-"
+                                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                                        </Grid>
+                                    </Border>
+
+                                    <Border Classes="settings-expander-shell">
+                                        <ui:SettingsExpander x:Name="UpdateOptionsSettingsExpander"
+                                                             Header="Update Options"
+                                                             Description="Configure update checks and release channel."
+                                                             IsExpanded="True">
+                                            <ui:SettingsExpander.Footer>
+                                                <StackPanel Spacing="10">
+                                                    <ToggleSwitch x:Name="AutoCheckUpdatesToggleSwitch"
+                                                                  Checked="OnAutoCheckUpdatesToggled"
+                                                                  Unchecked="OnAutoCheckUpdatesToggled"
+                                                                  Content="Automatically check for updates on startup" />
+                                                    <TextBlock x:Name="UpdateChannelLabelTextBlock"
+                                                               Text="Update Channel"
+                                                               FontWeight="SemiBold"
+                                                               Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+                                                    <ListBox x:Name="UpdateChannelChipListBox"
+                                                             SelectionChanged="OnUpdateChannelSelectionChanged">
+                                                        <ListBox.ItemsPanel>
+                                                            <ItemsPanelTemplate>
+                                                                <StackPanel Orientation="Horizontal" Spacing="8" />
+                                                            </ItemsPanelTemplate>
+                                                        </ListBox.ItemsPanel>
+                                                        <ListBoxItem x:Name="UpdateChannelStableChipItem"
+                                                                     Tag="Stable"
+                                                                     Content="Stable" />
+                                                        <ListBoxItem x:Name="UpdateChannelPreviewChipItem"
+                                                                     Tag="Preview"
+                                                                     Content="Preview" />
+                                                    </ListBox>
+                                                </StackPanel>
+                                            </ui:SettingsExpander.Footer>
+                                        </ui:SettingsExpander>
+                                    </Border>
+
+                                    <Border Classes="settings-expander-shell">
+                                        <ui:SettingsExpander x:Name="UpdateActionsSettingsExpander"
+                                                             Header="Update Actions"
+                                                             Description="Check releases, download installer, and start update."
+                                                             IsExpanded="True">
+                                            <ui:SettingsExpander.Footer>
+                                                <StackPanel Spacing="10">
+                                                    <StackPanel Orientation="Horizontal" Spacing="10">
+                                                        <Button x:Name="CheckForUpdatesButton"
+                                                                MinWidth="140"
+                                                                Click="OnCheckForUpdatesClick"
+                                                                Content="Check for Updates" />
+                                                        <Button x:Name="DownloadAndInstallUpdateButton"
+                                                                MinWidth="180"
+                                                                Click="OnDownloadAndInstallUpdateClick"
+                                                                Content="Download &amp; Install" />
+                                                    </StackPanel>
+                                                    <ProgressBar x:Name="UpdateDownloadProgressBar"
+                                                                 Minimum="0"
+                                                                 Maximum="100"
+                                                                 Height="6"
+                                                                 IsVisible="False" />
+                                                    <TextBlock x:Name="UpdateDownloadProgressTextBlock"
+                                                               Text="Download progress: -"
+                                                               Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
+                                                    <TextBlock x:Name="UpdateStatusTextBlock"
+                                                               Text="Ready to check for updates."
+                                                               Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                                                </StackPanel>
+                                            </ui:SettingsExpander.Footer>
+                                        </ui:SettingsExpander>
+                                    </Border>
+                                </StackPanel>
+
                                 <StackPanel x:Name="AboutSettingsPanel" IsVisible="False" Spacing="20">
                                     <TextBlock x:Name="AboutPanelTitleTextBlock" FontSize="24" FontWeight="SemiBold" Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" Text="About" />
                                         <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}" CornerRadius="{DynamicResource DesignCornerRadiusMd}" Padding="20">

LanMountainDesktop/Views/MainWindow.axaml.cs

@@ -91,8 +91,10 @@ public partial class MainWindow : Window
     private readonly LocalizationService _localizationService = new();
     private readonly TimeZoneService _timeZoneService = new();
     private readonly WindowsStartupService _windowsStartupService = new();
+    private readonly GitHubReleaseUpdateService _releaseUpdateService = new("wwiinnddyy", "LanMountainDesktop");
     private readonly IWeatherDataService _weatherDataService = new XiaomiWeatherService();
     private readonly IRecommendationInfoService _recommendationInfoService = new RecommendationDataService();
+    private readonly ICalculatorDataService _calculatorDataService = new CalculatorDataService();
     private readonly ComponentRegistry _componentRegistry = ComponentRegistry
         .CreateDefault()
         .RegisterExtensions(
@@ -126,6 +128,19 @@ public partial class MainWindow : Window
     private Media? _videoWallpaperMedia;
     private MediaPlayer? _previewVideoWallpaperPlayer;
     private Media? _previewVideoWallpaperMedia;
+    private readonly object _desktopVideoFrameSync = new();
+    private MediaPlayer.LibVLCVideoLockCb? _desktopVideoLockCallback;
+    private MediaPlayer.LibVLCVideoUnlockCb? _desktopVideoUnlockCallback;
+    private MediaPlayer.LibVLCVideoDisplayCb? _desktopVideoDisplayCallback;
+    private IntPtr _desktopVideoFrameBufferPtr;
+    private byte[]? _desktopVideoStagingBuffer;
+    private WriteableBitmap? _desktopVideoBitmap;
+    private int _desktopVideoFrameWidth;
+    private int _desktopVideoFrameHeight;
+    private int _desktopVideoFramePitch;
+    private int _desktopVideoFrameBufferSize;
+    private int _desktopVideoFrameDirtyFlag;
+    private int _desktopVideoFrameUiRefreshScheduledFlag;
     private string? _wallpaperPath;
     private string _wallpaperStatus = "Current background uses solid color.";
     private IReadOnlyList<Color> _recommendedColors = Array.Empty<Color>();
@@ -221,7 +236,7 @@ public partial class MainWindow : Window
         GridSizeSlider.ValueChanged += OnGridSizeSliderChanged;
         GridSizeNumberBox.ValueChanged += OnGridSizeNumberBoxChanged;
 
-        SettingsNavListBox.SelectedIndex = Math.Clamp(snapshot.SettingsTabIndex, 0, 6);
+        SettingsNavListBox.SelectedIndex = Math.Clamp(snapshot.SettingsTabIndex, 0, 7);
         UpdateSettingsTabContent();
 
         WallpaperPlacementComboBox.SelectedIndex = GetPlacementIndexFromSetting(snapshot.WallpaperPlacement);
@@ -231,6 +246,7 @@ public partial class MainWindow : Window
         InitializeWeatherSettings(snapshot);
         _dailyArtworkMirrorSource = DailyArtworkMirrorSources.Normalize(snapshot.DailyArtworkMirrorSource);
         InitializeAutoStartWithWindowsSetting(snapshot);
+        InitializeUpdateSettings(snapshot);
         InitializeDesktopSurfaceState(snapshot);
         InitializeDesktopComponentPlacements(snapshot);
         InitializeSettingsIcons();
@@ -262,6 +278,8 @@ public partial class MainWindow : Window
 
         _suppressSettingsPersistence = false;
         PersistSettings();
+
+        TriggerAutoUpdateCheckIfEnabled();
     }
 
     protected override void OnClosed(EventArgs e)
@@ -287,6 +305,7 @@ public partial class MainWindow : Window
         {
             recommendationServiceDisposable.Dispose();
         }
+        _releaseUpdateService.Dispose();
         _wallpaperBitmap?.Dispose();
         _wallpaperBitmap = null;
         PropertyChanged -= OnWindowPropertyChanged;