通知系统，自习系统，反正做了很多

LanMountainDesktop/App.axaml.cs

@@ -54,6 +54,7 @@ public partial class App : Application
     private ISettingsPageRegistry? _settingsPageRegistry;
     private ISettingsWindowService? _settingsWindowService;
     private WeatherLocationRefreshService? _weatherLocationRefreshService;
+    private INotificationService? _notificationService;
     private bool _exitCleanupCompleted;
     private DesktopShellState _desktopShellState = DesktopShellState.ForegroundDesktop;
     private ShutdownIntent _shutdownIntent;
@@ -73,6 +74,8 @@ public partial class App : Application
     internal static SingleInstanceService? CurrentSingleInstanceService { get; set; }
     internal static IHostApplicationLifecycle? CurrentHostApplicationLifecycle =>
         (Current as App)?._hostApplicationLifecycle;
+    internal static INotificationService? CurrentNotificationService =>
+        (Current as App)?._notificationService;
 
     // 隐私政策查看事件
     public static event Action? CurrentPrivacyPolicyViewRequested;
@@ -87,6 +90,7 @@ public partial class App : Application
     public ISettingsFacadeService SettingsFacade => _settingsFacade;
     public IHostApplicationLifecycle HostApplicationLifecycle => _hostApplicationLifecycle;
     internal ISettingsWindowService? SettingsWindowService => _settingsWindowService;
+    internal INotificationService? NotificationService => _notificationService;
 
     internal void OpenIndependentSettingsModule(string source, string? pageTag = null)
     {
@@ -128,6 +132,7 @@ public partial class App : Application
         ApplyCurrentCultureFromSettings();
         EnsureSettingsWindowService();
         EnsureWeatherLocationRefreshService();
+        EnsureNotificationService();
     }
 
     public override void OnFrameworkInitializationCompleted()
@@ -400,6 +405,11 @@ public partial class App : Application
             _localizationService);
     }
 
+    private void EnsureNotificationService()
+    {
+        _notificationService ??= new NotificationService(_appearanceThemeService);
+    }
+
     private void StartWeatherLocationRefreshIfNeeded()
     {
         EnsureWeatherLocationRefreshService();

LanMountainDesktop/Controls/SettingsOptionCard.axaml.cs

@@ -107,6 +107,8 @@ public partial class SettingsOptionCard : UserControl
             "PuzzlePiece" => Symbol.PuzzlePiece,
             "Info" => Symbol.Info,
             "ArrowSync" => Symbol.ArrowSync,
+            "Alert" => Symbol.Alert,
+            "Bell" => Symbol.Alert,  // Bell也映射到Alert图标
             _ => Symbol.Settings
         };
     }

LanMountainDesktop/Controls/SmoothBorder.cs

@@ -0,0 +1,234 @@
+using System;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Media;
+using Avalonia.Platform;
+
+namespace LanMountainDesktop.Controls;
+
+/// <summary>
+/// A Decorator that renders a border with continuous "Squircle" corners (super-ellipse).
+/// Ported and adapted from SeiWoLauncherPro for Avalonia 11.
+/// </summary>
+public class SmoothBorder : Decorator
+{
+    public static readonly StyledProperty<IBrush?> BackgroundProperty =
+        Border.BackgroundProperty.AddOwner<SmoothBorder>();
+
+    public static readonly StyledProperty<IBrush?> BorderBrushProperty =
+        Border.BorderBrushProperty.AddOwner<SmoothBorder>();
+
+    public static readonly StyledProperty<Thickness> BorderThicknessProperty =
+        Border.BorderThicknessProperty.AddOwner<SmoothBorder>();
+
+    public static readonly StyledProperty<CornerRadius> CornerRadiusProperty =
+        Border.CornerRadiusProperty.AddOwner<SmoothBorder>();
+
+    public static readonly StyledProperty<double> SmoothnessProperty =
+        AvaloniaProperty.Register<SmoothBorder, double>(nameof(Smoothness), 0.6);
+
+    public IBrush? Background
+    {
+        get => GetValue(BackgroundProperty);
+        set => SetValue(BackgroundProperty, value);
+    }
+
+    public IBrush? BorderBrush
+    {
+        get => GetValue(BorderBrushProperty);
+        set => SetValue(BorderBrushProperty, value);
+    }
+
+    public Thickness BorderThickness
+    {
+        get => GetValue(BorderThicknessProperty);
+        set => SetValue(BorderThicknessProperty, value);
+    }
+
+    public CornerRadius CornerRadius
+    {
+        get => GetValue(CornerRadiusProperty);
+        set => SetValue(CornerRadiusProperty, value);
+    }
+
+    public double Smoothness
+    {
+        get => GetValue(SmoothnessProperty);
+        set => SetValue(SmoothnessProperty, value);
+    }
+
+    static SmoothBorder()
+    {
+        AffectsRender<SmoothBorder>(BackgroundProperty, BorderBrushProperty, BorderThicknessProperty, CornerRadiusProperty, SmoothnessProperty);
+        AffectsMeasure<SmoothBorder>(BorderThicknessProperty);
+    }
+
+    protected override Size MeasureOverride(Size constraint)
+    {
+        var padding = BorderThickness;
+        if (Child != null)
+        {
+            Child.Measure(constraint.Deflate(padding));
+            return Child.DesiredSize.Inflate(padding);
+        }
+        return new Size(padding.Left + padding.Right, padding.Top + padding.Bottom);
+    }
+
+    protected override Size ArrangeOverride(Size finalSize)
+    {
+        if (Child != null)
+        {
+            var padding = BorderThickness;
+            Child.Arrange(new Rect(finalSize).Deflate(padding));
+            Child.Clip = CreateSquircle(new Rect(0, 0, finalSize.Width - padding.Left - padding.Right, finalSize.Height - padding.Top - padding.Bottom), CornerRadius, Smoothness);
+        }
+        return finalSize;
+    }
+
+    public override void Render(DrawingContext context)
+    {
+        var rect = new Rect(Bounds.Size);
+        if (rect.Width <= 0 || rect.Height <= 0) return;
+
+        var geometry = CreateSquircle(rect, CornerRadius, Smoothness);
+        
+        if (Background != null)
+        {
+            context.DrawGeometry(Background, null, geometry);
+        }
+
+        if (BorderBrush != null && BorderThickness != default)
+        {
+            // Simple implementation for uniform thickness
+            var pen = new Pen(BorderBrush, BorderThickness.Left);
+            context.DrawGeometry(null, pen, geometry);
+        }
+        
+        // Apply clipping to children if needed
+        // Note: In Avalonia 11, we usually set Clip property on the child or use a Clip content property.
+    }
+
+    private static Geometry CreateSquircle(Rect rect, CornerRadius radius, double smoothness)
+    {
+        smoothness = Math.Clamp(smoothness, 0, 1);
+        var geometry = new StreamGeometry();
+        using (var ctx = geometry.Open())
+        {
+            // Top-left starting point
+            double pTL = radius.TopLeft * (1 + smoothness);
+            ctx.BeginFigure(new Point(rect.Left + pTL, rect.Top), true);
+
+            // Top-right corner
+            DrawCorner(ctx, rect, radius.TopRight, smoothness, Corner.TopRight);
+            // Bottom-right corner
+            DrawCorner(ctx, rect, radius.BottomRight, smoothness, Corner.BottomRight);
+            // Bottom-left corner
+            DrawCorner(ctx, rect, radius.BottomLeft, smoothness, Corner.BottomLeft);
+            // Top-left corner (closing)
+            DrawCorner(ctx, rect, radius.TopLeft, smoothness, Corner.TopLeft);
+
+            ctx.EndFigure(true);
+        }
+        return geometry;
+    }
+
+    private enum Corner { TopRight, BottomRight, BottomLeft, TopLeft }
+
+    private static void DrawCorner(StreamGeometryContext ctx, Rect rect, double radius, double smoothness, Corner corner)
+    {
+        if (radius <= 0)
+        {
+            Point pt = corner switch {
+                Corner.TopRight => rect.TopRight,
+                Corner.BottomRight => rect.BottomRight,
+                Corner.BottomLeft => rect.BottomLeft,
+                Corner.TopLeft => rect.TopLeft,
+                _ => default
+            };
+            ctx.LineTo(pt);
+            return;
+        }
+
+        double p = radius * (1 + smoothness);
+        double theta = 45 * smoothness;
+        double radTheta = theta * (Math.PI / 180.0);
+        double radBeta = (90 * (1 - smoothness)) * (Math.PI / 180.0);
+
+        double c = radius * Math.Tan(radTheta / 2) * Math.Cos(radTheta);
+        double d = radius * Math.Tan(radTheta / 2) * Math.Sin(radTheta);
+        double arcSeg = Math.Sin(radBeta / 2) * radius * Math.Sqrt(2);
+
+        double b = (p - arcSeg - c - d) / 3;
+        double a = 2 * b;
+
+        // Points relative to corner
+        Point[] points = corner switch
+        {
+            Corner.TopRight => new[] {
+                new Point(rect.Right - (p - a - b - c), rect.Top + d), 
+                new Point(rect.Right - (p - a), rect.Top), 
+                new Point(rect.Right - (p - a - b), rect.Top),
+                new Point(rect.Right, rect.Top + p), 
+                new Point(rect.Right, rect.Top + p - a - b), 
+                new Point(rect.Right, rect.Top + p - a)
+            },
+            Corner.BottomRight => new[] {
+                new Point(rect.Right - d, rect.Bottom - (p - a - b - c)), 
+                new Point(rect.Right, rect.Bottom - (p - a)), 
+                new Point(rect.Right, rect.Bottom - (p - a - b)),
+                new Point(rect.Right - p, rect.Bottom), 
+                new Point(rect.Right - (p - a - b), rect.Bottom), 
+                new Point(rect.Right - (p - a), rect.Bottom)
+            },
+            Corner.BottomLeft => new[] {
+                new Point(rect.Left + (p - a - b - c), rect.Bottom - d), 
+                new Point(rect.Left + (p - a), rect.Bottom), 
+                new Point(rect.Left + (p - a - b), rect.Bottom),
+                new Point(rect.Left, rect.Bottom - p), 
+                new Point(rect.Left, rect.Bottom - (p - a - b)), 
+                new Point(rect.Left, rect.Bottom - (p - a))
+            },
+            Corner.TopLeft => new[] {
+                new Point(rect.Left + d, rect.Top + (p - a - b - c)), 
+                new Point(rect.Left, rect.Top + (p - a)), 
+                new Point(rect.Left, rect.Top + (p - a - b)),
+                new Point(rect.Left + p, rect.Top), 
+                new Point(rect.Left + (p - a - b), rect.Top), 
+                new Point(rect.Left + (p - a), rect.Top)
+            },
+            _ => throw new ArgumentOutOfRangeException()
+        };
+
+        // 1. Line to start of segment
+        ctx.LineTo(corner switch {
+            Corner.TopRight => new Point(rect.Right - p, rect.Top),
+            Corner.BottomRight => new Point(rect.Right, rect.Bottom - p),
+            Corner.BottomLeft => new Point(rect.Left + p, rect.Bottom),
+            Corner.TopLeft => new Point(rect.Left, rect.Top + p),
+            _ => default
+        });
+
+        // 2. First Bezier
+        ctx.CubicBezierTo(points[1], points[2], points[0]);
+
+        // 3. Arc
+        double startAngle = corner switch {
+            Corner.TopRight => 270, Corner.BottomRight => 0, Corner.BottomLeft => 90, Corner.TopLeft => 180, _ => 0
+        };
+        double arcEndAngle = startAngle + 90 - theta;
+        double endRad = arcEndAngle * (Math.PI / 180.0);
+        Point center = corner switch {
+            Corner.TopRight => new Point(rect.Right - radius, rect.Top + radius),
+            Corner.BottomRight => new Point(rect.Right - radius, rect.Bottom - radius),
+            Corner.BottomLeft => new Point(rect.Left + radius, rect.Bottom - radius),
+            Corner.TopLeft => new Point(rect.Left + radius, rect.Top + radius),
+            _ => default
+        };
+        Point arcEnd = new Point(center.X + radius * Math.Cos(endRad), center.Y + radius * Math.Sin(endRad));
+        
+        ctx.ArcTo(arcEnd, new Size(radius, radius), 0, false, SweepDirection.Clockwise);
+
+        // 4. Second Bezier
+        ctx.CubicBezierTo(points[4], points[5], points[3]);
+    }
+}

LanMountainDesktop/Localization/en-US.json

@@ -251,6 +251,15 @@
     "settings.study.avg_window_label":  "Averaging Window",
     "settings.study.avg_window_desc":  "Time window for smoothing noise display. Larger values make display more stable but slower to respond.",
     "settings.study.footer_hint":  "These settings affect the behavior of study environment monitoring components.",
+    "common.unit.minutes":  "minutes",
+    "common.unit.seconds":  "seconds",
+    "common.unit.times":  "times",
+    "common.error.save_failed":  "Failed to save settings, please try again later",
+    "common.error.load_failed":  "Failed to load settings, please try again later",
+    "study.alert.noise_interrupt_title":  "Noise Interrupt Alert",
+    "study.alert.noise_interrupt_message":  "Current interrupt density: {0}/min\nExceeds threshold: {1}/min",
+    "study.alert.severe_interrupt_title":  "Severe Noise Interference",
+    "study.alert.severe_interrupt_message":  "Environment is too noisy, severely affecting learning efficiency\nCurrent interrupt density: {0}/min\nSuggestion: Find a quieter study environment",
     "settings.weather.location_header":  "Weather Location",
     "settings.weather.location_desc":  "Set the location used by weather widgets.",
     "settings.weather.location_placeholder":  "e.g. Beijing",

LanMountainDesktop/Localization/zh-CN.json

@@ -254,6 +254,15 @@
     "settings.study.avg_window_label":  "平均时间窗",
     "settings.study.avg_window_desc":  "噪音平滑显示的时间窗口，较大的值会使显示更稳定但响应更慢。",
     "settings.study.footer_hint":  "这些设置将影响自习环境监测组件的行为。",
+    "common.unit.minutes":  "分钟",
+    "common.unit.seconds":  "秒",
+    "common.unit.times":  "次",
+    "common.error.save_failed":  "设置保存失败，请稍后重试",
+    "common.error.load_failed":  "设置加载失败，请稍后重试",
+    "study.alert.noise_interrupt_title":  "噪音打断提醒",
+    "study.alert.noise_interrupt_message":  "当前打断密度: {0}次/分钟\n已超过阈值: {1}次/分钟",
+    "study.alert.severe_interrupt_title":  "严重噪音干扰",
+    "study.alert.severe_interrupt_message":  "环境噪音过于嘈杂，严重影响学习效率\n当前打断密度: {0}次/分钟\n建议：寻找更安静的学习环境",
     "weather.widget.location_not_configured":  "尚未配置天气位置",
     "weather.widget.configure_hint":  "请前往 设置 > 天气 完成配置",
     "weather.widget.loading":  "加载中...",

LanMountainDesktop/Models/AppSettingsSnapshot.cs

@@ -150,6 +150,22 @@ public sealed class AppSettingsSnapshot
 
     #endregion
 
+    #region Notification Settings
+
+    public bool NotificationEnabled { get; set; } = true;
+
+    public string NotificationDefaultPosition { get; set; } = "TopRight";
+
+    public int NotificationDurationSeconds { get; set; } = 4;
+
+    public bool NotificationHoverPauseEnabled { get; set; } = true;
+
+    public bool NotificationClickCloseEnabled { get; set; } = true;
+
+    public int NotificationMaxPerPosition { get; set; } = 5;
+
+    #endregion
+
     public AppSettingsSnapshot Clone()
     {
         var clone = (AppSettingsSnapshot)MemberwiseClone();

LanMountainDesktop/Services/NotificationService.cs

@@ -0,0 +1,503 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Media.Imaging;
+using Avalonia.Platform;
+using Avalonia.Threading;
+using FluentAvalonia.UI.Controls;
+using LanMountainDesktop.Models;
+using LanMountainDesktop.PluginSdk;
+using LanMountainDesktop.Services.Settings;
+using LanMountainDesktop.ViewModels;
+using LanMountainDesktop.Views;
+
+namespace LanMountainDesktop.Services;
+
+public enum NotificationPosition
+{
+    TopLeft = 0,
+    TopRight = 1,
+    TopCenter = 2,
+    BottomLeft = 3,
+    BottomRight = 4,
+    BottomCenter = 5,
+    Center = 6
+}
+
+public enum NotificationSeverity
+{
+    Info = 0,
+    Success = 1,
+    Warning = 2,
+    Error = 3
+}
+
+public readonly record struct NotificationContent(
+    string Title,
+    string? Message = null,
+    Stream? IconStream = null,
+    string? IconPath = null,
+    Bitmap? IconBitmap = null,
+    NotificationSeverity Severity = NotificationSeverity.Info,
+    NotificationPosition Position = NotificationPosition.TopRight,
+    TimeSpan? Duration = null,
+    Action? OnClick = null,
+    string? PrimaryButtonText = null,
+    string? SecondaryButtonText = null,
+    string? CloseButtonText = null,
+    Action? OnPrimaryButtonClick = null,
+    Action? OnSecondaryButtonClick = null)
+{
+    public TimeSpan EffectiveDuration => Duration ?? TimeSpan.FromSeconds(4);
+
+    /// <summary>
+    /// Indicates whether this notification should be shown as a dialog (center position)
+    /// or as a toast notification (other positions)
+    /// </summary>
+    public bool IsDialogNotification => Position == NotificationPosition.Center;
+}
+
+public interface INotificationService
+{
+    void Show(NotificationContent content);
+
+    Task<ContentDialogResult> ShowDialogAsync(NotificationContent content);
+
+    void ShowInfo(string title, string? message = null,
+        NotificationPosition position = NotificationPosition.TopRight);
+
+    void ShowSuccess(string title, string? message = null,
+        NotificationPosition position = NotificationPosition.TopRight);
+
+    void ShowWarning(string title, string? message = null,
+        NotificationPosition position = NotificationPosition.TopRight);
+
+    void ShowError(string title, string? message = null,
+        NotificationPosition position = NotificationPosition.TopRight);
+
+    Task<ContentDialogResult> ShowDialogInfoAsync(string title, string? message = null,
+        string? primaryButtonText = "确定", string? closeButtonText = "取消");
+
+    Task<ContentDialogResult> ShowDialogSuccessAsync(string title, string? message = null,
+        string? primaryButtonText = "确定", string? closeButtonText = "取消");
+
+    Task<ContentDialogResult> ShowDialogWarningAsync(string title, string? message = null,
+        string? primaryButtonText = "确定", string? closeButtonText = "取消");
+
+    Task<ContentDialogResult> ShowDialogErrorAsync(string title, string? message = null,
+        string? primaryButtonText = "确定", string? closeButtonText = "取消");
+}
+
+internal sealed class NotificationService : INotificationService
+{
+    private readonly IAppearanceThemeService? _appearanceThemeService;
+    private readonly NotificationWindowManager _windowManager;
+
+    public NotificationService(IAppearanceThemeService? appearanceThemeService = null)
+    {
+        _appearanceThemeService = appearanceThemeService;
+        _windowManager = NotificationWindowManager.Instance;
+    }
+
+    public void Show(NotificationContent content)
+    {
+        // 检查通知开关是否启用
+        if (!IsNotificationEnabled())
+        {
+            return; // 通知已禁用，不显示
+        }
+
+        // If it's a dialog notification (center position), show as dialog window
+        if (content.IsDialogNotification)
+        {
+            Dispatcher.UIThread.Post(() => ShowDialogWindow(content), DispatcherPriority.Normal);
+            return;
+        }
+
+        // Otherwise, show as toast notification
+        Dispatcher.UIThread.Post(() => ShowCore(content), DispatcherPriority.Normal);
+    }
+
+    private void ShowDialogWindow(NotificationContent content)
+    {
+        var window = new NotificationDialogWindow();
+        window.Initialize(content, _appearanceThemeService);
+
+        Screen? screen = null;
+        if (Avalonia.Application.Current?.ApplicationLifetime is Avalonia.Controls.ApplicationLifetimes.IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            screen = desktop.MainWindow?.Screens?.Primary;
+        }
+        var workingArea = screen?.WorkingArea ?? new PixelRect(0, 0, 1920, 1080);
+
+        window.Measure(Size.Infinity);
+        var windowWidth = window.DesiredSize.Width > 0 ? window.DesiredSize.Width : 400;
+        var windowHeight = window.DesiredSize.Height > 0 ? window.DesiredSize.Height : 200;
+
+        var centerX = workingArea.X + (workingArea.Width - (int)Math.Round(windowWidth)) / 2;
+        var centerY = workingArea.Y + (workingArea.Height - (int)Math.Round(windowHeight)) / 2;
+        window.Position = new PixelPoint(centerX, centerY);
+
+        window.Show();
+
+        _ = Task.Run(async () =>
+        {
+            if (window.CompletionSource is not null)
+            {
+                await window.CompletionSource.Task;
+            }
+        });
+    }
+
+    public async Task<ContentDialogResult> ShowDialogAsync(NotificationContent content)
+    {
+        // 检查通知开关是否启用
+        if (!IsNotificationEnabled())
+        {
+            return ContentDialogResult.None; // 通知已禁用，不显示
+        }
+
+        return await Dispatcher.UIThread.InvokeAsync(() => ShowDialogCoreAsync(content));
+    }
+
+    private async Task<ContentDialogResult> ShowDialogCoreAsync(NotificationContent content)
+    {
+        // Get the main window as the dialog host
+        var mainWindow = GetMainWindow();
+        if (mainWindow is null)
+        {
+            AppLogger.Warn("Notification", "Cannot show dialog notification: main window not found");
+            return ContentDialogResult.None;
+        }
+
+        var dialog = new ContentDialog
+        {
+            Title = content.Title,
+            Content = content.Message ?? string.Empty,
+            PrimaryButtonText = content.PrimaryButtonText,
+            SecondaryButtonText = content.SecondaryButtonText,
+            CloseButtonText = content.CloseButtonText,
+            DefaultButton = !string.IsNullOrEmpty(content.PrimaryButtonText) ? ContentDialogButton.Primary :
+                           !string.IsNullOrEmpty(content.SecondaryButtonText) ? ContentDialogButton.Secondary :
+                           ContentDialogButton.Close
+        };
+
+        var result = await dialog.ShowAsync(mainWindow);
+
+        // Execute callbacks based on result
+        switch (result)
+        {
+            case ContentDialogResult.Primary:
+                content.OnPrimaryButtonClick?.Invoke();
+                break;
+            case ContentDialogResult.Secondary:
+                content.OnSecondaryButtonClick?.Invoke();
+                break;
+        }
+
+        return result;
+    }
+
+    private static bool IsNotificationEnabled()
+    {
+        try
+        {
+            // 从全局设置服务中读取通知开关状态
+            var settingsFacade = HostSettingsFacadeProvider.GetOrCreate();
+            var snapshot = settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(PluginSdk.SettingsScope.App);
+            return snapshot.NotificationEnabled;
+        }
+        catch
+        {
+            // 如果读取失败，默认启用通知
+            return true;
+        }
+    }
+
+    private static Window? GetMainWindow()
+    {
+        if (Application.Current?.ApplicationLifetime is Avalonia.Controls.ApplicationLifetimes.IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            return desktop.MainWindow;
+        }
+        return null;
+    }
+
+    private void ShowCore(NotificationContent content)
+    {
+        var viewModel = new NotificationViewModel
+        {
+            Title = content.Title,
+            Message = content.Message,
+            Severity = content.Severity,
+            Position = content.Position,
+            Duration = content.EffectiveDuration,
+            OnClick = content.OnClick
+        };
+
+        if (content.IconBitmap is not null)
+        {
+            viewModel.Icon = content.IconBitmap;
+        }
+        else if (content.IconStream is not null)
+        {
+            viewModel.Icon = new Bitmap(content.IconStream);
+        }
+        else if (!string.IsNullOrEmpty(content.IconPath))
+        {
+            try
+            {
+                viewModel.Icon = new Bitmap(content.IconPath);
+            }
+            catch
+            {
+                AppLogger.Warn("Notification", $"Failed to load icon from path: {content.IconPath}");
+            }
+        }
+
+        _windowManager.ShowNotification(viewModel, _appearanceThemeService);
+    }
+
+    public void ShowInfo(string title, string? message = null,
+        NotificationPosition position = NotificationPosition.TopRight)
+    {
+        Show(new NotificationContent(title, message, Severity: NotificationSeverity.Info, Position: position));
+    }
+
+    public void ShowSuccess(string title, string? message = null,
+        NotificationPosition position = NotificationPosition.TopRight)
+    {
+        Show(new NotificationContent(title, message, Severity: NotificationSeverity.Success, Position: position));
+    }
+
+    public void ShowWarning(string title, string? message = null,
+        NotificationPosition position = NotificationPosition.TopRight)
+    {
+        Show(new NotificationContent(title, message, Severity: NotificationSeverity.Warning, Position: position));
+    }
+
+    public void ShowError(string title, string? message = null,
+        NotificationPosition position = NotificationPosition.TopRight)
+    {
+        Show(new NotificationContent(title, message, Severity: NotificationSeverity.Error, Position: position));
+    }
+
+    public Task<ContentDialogResult> ShowDialogInfoAsync(string title, string? message = null,
+        string? primaryButtonText = "确定", string? closeButtonText = "取消")
+    {
+        return ShowDialogAsync(new NotificationContent(
+            title,
+            message,
+            Severity: NotificationSeverity.Info,
+            Position: NotificationPosition.Center,
+            PrimaryButtonText: primaryButtonText,
+            CloseButtonText: closeButtonText));
+    }
+
+    public Task<ContentDialogResult> ShowDialogSuccessAsync(string title, string? message = null,
+        string? primaryButtonText = "确定", string? closeButtonText = "取消")
+    {
+        return ShowDialogAsync(new NotificationContent(
+            title,
+            message,
+            Severity: NotificationSeverity.Success,
+            Position: NotificationPosition.Center,
+            PrimaryButtonText: primaryButtonText,
+            CloseButtonText: closeButtonText));
+    }
+
+    public Task<ContentDialogResult> ShowDialogWarningAsync(string title, string? message = null,
+        string? primaryButtonText = "确定", string? closeButtonText = "取消")
+    {
+        return ShowDialogAsync(new NotificationContent(
+            title,
+            message,
+            Severity: NotificationSeverity.Warning,
+            Position: NotificationPosition.Center,
+            PrimaryButtonText: primaryButtonText,
+            CloseButtonText: closeButtonText));
+    }
+
+    public Task<ContentDialogResult> ShowDialogErrorAsync(string title, string? message = null,
+        string? primaryButtonText = "确定", string? closeButtonText = "取消")
+    {
+        return ShowDialogAsync(new NotificationContent(
+            title,
+            message,
+            Severity: NotificationSeverity.Error,
+            Position: NotificationPosition.Center,
+            PrimaryButtonText: primaryButtonText,
+            CloseButtonText: closeButtonText));
+    }
+}
+
+internal sealed class NotificationWindowManager
+{
+    private static NotificationWindowManager? _instance;
+    public static NotificationWindowManager Instance => _instance ??= new NotificationWindowManager();
+
+    private readonly Dictionary<NotificationPosition, List<NotificationWindow>> _windowsByPosition = new();
+    private const double Margin = 12;
+    private const double Spacing = 6;
+
+    private NotificationWindowManager()
+    {
+        foreach (var position in Enum.GetValues<NotificationPosition>())
+        {
+            _windowsByPosition[position] = new List<NotificationWindow>();
+        }
+    }
+
+    public void ShowNotification(NotificationViewModel viewModel, IAppearanceThemeService? themeService)
+    {
+        var position = viewModel.Position;
+        var windows = _windowsByPosition[position];
+
+        // 从设置中读取最大通知数量
+        var maxNotifications = GetMaxNotificationsPerPosition();
+
+        if (windows.Count >= maxNotifications)
+        {
+            var oldestWindow = windows[0];
+            windows.RemoveAt(0);
+            oldestWindow.Close();
+        }
+
+        var window = new NotificationWindow();
+        window.Initialize(viewModel, themeService);
+        window.Closed += OnWindowClosed;
+
+        windows.Add(window);
+        UpdateWindowPositions(position);
+
+        window.ShowWithAnimationAsync();
+    }
+
+    private void OnWindowClosed(object? sender, EventArgs e)
+    {
+        if (sender is not NotificationWindow window) return;
+
+        var position = window.NotificationPositionValue;
+        var windows = _windowsByPosition.GetValueOrDefault(position);
+        if (windows is null) return;
+
+        windows.Remove(window);
+        window.Closed -= OnWindowClosed;
+
+        UpdateWindowPositions(position);
+    }
+
+    private static int GetMaxNotificationsPerPosition()
+    {
+        try
+        {
+            // 从全局设置服务中读取最大通知数量
+            var settingsFacade = HostSettingsFacadeProvider.GetOrCreate();
+            var snapshot = settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(PluginSdk.SettingsScope.App);
+            return snapshot.NotificationMaxPerPosition > 0 ? snapshot.NotificationMaxPerPosition : 5;
+        }
+        catch
+        {
+            // 如果读取失败，返回默认值
+            return 5;
+        }
+    }
+
+    private void UpdateWindowPositions(NotificationPosition position)
+    {
+        var windows = _windowsByPosition.GetValueOrDefault(position);
+        if (windows is null || windows.Count == 0) return;
+
+        var screen = GetPrimaryScreen();
+        var workingArea = screen?.WorkingArea ?? new PixelRect(0, 0, 1920, 1080);
+        var scale = 1d;
+
+        for (var i = 0; i < windows.Count; i++)
+        {
+            var window = windows[i];
+            var targetPosition = CalculateWindowPosition(window, position, workingArea, scale, i);
+            window.Position = targetPosition;
+        }
+    }
+
+    private PixelPoint CalculateWindowPosition(
+        NotificationWindow window,
+        NotificationPosition position,
+        PixelRect workingArea,
+        double scale,
+        int stackIndex)
+    {
+        window.Measure(Size.Infinity);
+        var windowWidth = window.DesiredSize.Width > 0 ? window.DesiredSize.Width : 320;
+        var windowHeight = window.DesiredSize.Height > 0 ? window.DesiredSize.Height : 80;
+
+        var margin = (int)Math.Round(Margin * scale);
+        var spacing = (int)Math.Round(Spacing * scale);
+        var stackedOffset = stackIndex * ((int)Math.Round(windowHeight) + spacing);
+
+        return position switch
+        {
+            NotificationPosition.TopLeft => new PixelPoint(
+                workingArea.X + margin,
+                workingArea.Y + margin + stackedOffset),
+
+            NotificationPosition.TopRight => new PixelPoint(
+                workingArea.Right - (int)Math.Round(windowWidth) - margin,
+                workingArea.Y + margin + stackedOffset),
+
+            NotificationPosition.TopCenter => new PixelPoint(
+                workingArea.X + (workingArea.Width - (int)Math.Round(windowWidth)) / 2,
+                workingArea.Y + margin + stackedOffset),
+
+            NotificationPosition.BottomLeft => new PixelPoint(
+                workingArea.X + margin,
+                workingArea.Bottom - (int)Math.Round(windowHeight) - margin - stackedOffset),
+
+            NotificationPosition.BottomRight => new PixelPoint(
+                workingArea.Right - (int)Math.Round(windowWidth) - margin,
+                workingArea.Bottom - (int)Math.Round(windowHeight) - margin - stackedOffset),
+
+            NotificationPosition.BottomCenter => new PixelPoint(
+                workingArea.X + (workingArea.Width - (int)Math.Round(windowWidth)) / 2,
+                workingArea.Bottom - (int)Math.Round(windowHeight) - margin - stackedOffset),
+
+            NotificationPosition.Center => new PixelPoint(
+                workingArea.X + (workingArea.Width - (int)Math.Round(windowWidth)) / 2,
+                workingArea.Y + (workingArea.Height - (int)Math.Round(windowHeight)) / 2),
+
+            _ => new PixelPoint(
+                workingArea.Right - (int)Math.Round(windowWidth) - margin,
+                workingArea.Y + margin + stackedOffset)
+        };
+    }
+
+    private static Screen? GetPrimaryScreen()
+    {
+        if (Avalonia.Application.Current?.ApplicationLifetime is Avalonia.Controls.ApplicationLifetimes.IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            return desktop.MainWindow?.Screens?.Primary;
+        }
+        return null;
+    }
+
+    public void ApplyThemeToAllWindows(AppearanceThemeSnapshot snapshot)
+    {
+        foreach (var windows in _windowsByPosition.Values)
+        {
+            foreach (var window in windows.ToList())
+            {
+                try
+                {
+                    window.RequestedThemeVariant = snapshot.IsNightMode ? Avalonia.Styling.ThemeVariant.Dark : Avalonia.Styling.ThemeVariant.Light;
+                }
+                catch
+                {
+                }
+            }
+        }
+    }
+}

LanMountainDesktop/ViewModels/NotificationSettingsPageViewModel.cs

@@ -0,0 +1,192 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using LanMountainDesktop.Models;
+using LanMountainDesktop.PluginSdk;
+using LanMountainDesktop.Services;
+using LanMountainDesktop.Services.Settings;
+
+namespace LanMountainDesktop.ViewModels;
+
+public sealed partial class NotificationSettingsPageViewModel : ViewModelBase
+{
+    private readonly ISettingsFacadeService _settingsFacade;
+    private bool _isInitializing;
+
+    public NotificationSettingsPageViewModel(ISettingsFacadeService settingsFacade)
+    {
+        _settingsFacade = settingsFacade ?? throw new ArgumentNullException(nameof(settingsFacade));
+
+        Positions = CreatePositionOptions();
+        Durations = CreateDurationOptions();
+        TestPositions = CreatePositionOptions();
+        TestSeverities = CreateSeverityOptions();
+
+        LoadSettings();
+
+        // Initialize test selections
+        SelectedTestPosition = TestPositions[1]; // TopRight
+        SelectedTestSeverity = TestSeverities[0]; // Info
+        TestDurationSeconds = 4; // Default 4 seconds
+    }
+
+    private void LoadSettings()
+    {
+        var snapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
+
+        _isInitializing = true;
+
+        IsNotificationEnabled = snapshot.NotificationEnabled;
+        IsHoverPauseEnabled = snapshot.NotificationHoverPauseEnabled;
+        IsClickCloseEnabled = snapshot.NotificationClickCloseEnabled;
+        MaxNotificationsPerPosition = snapshot.NotificationMaxPerPosition;
+
+        SelectedPosition = Positions.FirstOrDefault(p =>
+            string.Equals(p.Value, snapshot.NotificationDefaultPosition, StringComparison.OrdinalIgnoreCase))
+            ?? Positions[1];
+
+        SelectedDuration = Durations.FirstOrDefault(d =>
+            int.TryParse(d.Value, out var seconds) && seconds == snapshot.NotificationDurationSeconds)
+            ?? Durations[1];
+
+        _isInitializing = false;
+    }
+
+    private void SaveSettings()
+    {
+        if (_isInitializing) return;
+
+        var snapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
+
+        snapshot.NotificationEnabled = IsNotificationEnabled;
+        snapshot.NotificationDefaultPosition = SelectedPosition?.Value ?? "TopRight";
+        snapshot.NotificationDurationSeconds = int.TryParse(SelectedDuration?.Value, out var seconds) ? seconds : 4;
+        snapshot.NotificationHoverPauseEnabled = IsHoverPauseEnabled;
+        snapshot.NotificationClickCloseEnabled = IsClickCloseEnabled;
+        snapshot.NotificationMaxPerPosition = MaxNotificationsPerPosition;
+
+        _settingsFacade.Settings.SaveSnapshot(
+            SettingsScope.App,
+            snapshot,
+            changedKeys:
+            [
+                nameof(AppSettingsSnapshot.NotificationEnabled),
+                nameof(AppSettingsSnapshot.NotificationDefaultPosition),
+                nameof(AppSettingsSnapshot.NotificationDurationSeconds),
+                nameof(AppSettingsSnapshot.NotificationHoverPauseEnabled),
+                nameof(AppSettingsSnapshot.NotificationClickCloseEnabled),
+                nameof(AppSettingsSnapshot.NotificationMaxPerPosition)
+            ]);
+    }
+
+    private static ObservableCollection<SelectionOption> CreatePositionOptions()
+    {
+        return
+        [
+            new SelectionOption("TopLeft", "左上角"),
+            new SelectionOption("TopRight", "右上角"),
+            new SelectionOption("TopCenter", "正上方"),
+            new SelectionOption("BottomLeft", "左下角"),
+            new SelectionOption("BottomRight", "右下角"),
+            new SelectionOption("BottomCenter", "正下方"),
+            new SelectionOption("Center", "正中央")
+        ];
+    }
+
+    private static ObservableCollection<SelectionOption> CreateDurationOptions()
+    {
+        return
+        [
+            new SelectionOption("2", "2 秒"),
+            new SelectionOption("4", "4 秒"),
+            new SelectionOption("6", "6 秒"),
+            new SelectionOption("8", "8 秒"),
+            new SelectionOption("10", "10 秒")
+        ];
+    }
+
+    private static ObservableCollection<SelectionOption> CreateSeverityOptions()
+    {
+        return
+        [
+            new SelectionOption("Info", "信息"),
+            new SelectionOption("Success", "成功"),
+            new SelectionOption("Warning", "警告"),
+            new SelectionOption("Error", "错误")
+        ];
+    }
+
+    [ObservableProperty] private string _notificationHeader = "通知";
+    [ObservableProperty] private string _enableNotificationHeader = "启用通知";
+    [ObservableProperty] private string _enableNotificationDescription = "开启或关闭全局通知功能";
+    [ObservableProperty] private string _defaultPositionHeader = "默认位置";
+    [ObservableProperty] private string _defaultPositionDescription = "通知弹出的默认位置";
+    [ObservableProperty] private string _durationHeader = "显示时长";
+    [ObservableProperty] private string _durationDescription = "通知自动关闭的时间";
+    [ObservableProperty] private string _behaviorHeader = "行为";
+    [ObservableProperty] private string _hoverPauseHeader = "悬停暂停";
+    [ObservableProperty] private string _hoverPauseDescription = "鼠标悬停时暂停自动关闭计时";
+    [ObservableProperty] private string _clickCloseHeader = "点击关闭";
+    [ObservableProperty] private string _clickCloseDescription = "点击通知后关闭";
+    [ObservableProperty] private string _maxNotificationsHeader = "最大数量";
+    [ObservableProperty] private string _maxNotificationsDescription = "每个位置最多显示的通知数量";
+    [ObservableProperty] private string _testHeader = "测试";
+    [ObservableProperty] private string _testNotificationHeader = "测试通知";
+    [ObservableProperty] private string _testNotificationDescription = "选择位置和类型，发送测试通知";
+    [ObservableProperty] private string _sendTestButtonText = "发送";
+
+    [ObservableProperty] private bool _isNotificationEnabled = true;
+    [ObservableProperty] private bool _isHoverPauseEnabled = true;
+    [ObservableProperty] private bool _isClickCloseEnabled = true;
+    [ObservableProperty] private int _maxNotificationsPerPosition = 5;
+
+    [ObservableProperty] private SelectionOption? _selectedPosition;
+    [ObservableProperty] private SelectionOption? _selectedDuration;
+    [ObservableProperty] private SelectionOption? _selectedTestPosition;
+    [ObservableProperty] private SelectionOption? _selectedTestSeverity;
+    [ObservableProperty] private int _testDurationSeconds = 4;
+
+    public ObservableCollection<SelectionOption> Positions { get; }
+    public ObservableCollection<SelectionOption> Durations { get; }
+    public ObservableCollection<SelectionOption> TestPositions { get; }
+    public ObservableCollection<SelectionOption> TestSeverities { get; }
+
+    partial void OnIsNotificationEnabledChanged(bool value) => SaveSettings();
+    partial void OnIsHoverPauseEnabledChanged(bool value) => SaveSettings();
+    partial void OnIsClickCloseEnabledChanged(bool value) => SaveSettings();
+    partial void OnMaxNotificationsPerPositionChanged(int value) => SaveSettings();
+    partial void OnSelectedPositionChanged(SelectionOption? value) => SaveSettings();
+    partial void OnSelectedDurationChanged(SelectionOption? value) => SaveSettings();
+
+    [RelayCommand]
+    private void SendTest()
+    {
+        if (SelectedTestPosition is null || SelectedTestSeverity is null)
+            return;
+
+        var position = Enum.Parse<NotificationPosition>(SelectedTestPosition.Value);
+        var severity = SelectedTestSeverity.Value;
+
+        var (title, message) = severity! switch
+        {
+            "Info" => ("测试通知", "这是一条信息类型的通知"),
+            "Success" => ("操作成功", "任务已完成"),
+            "Warning" => ("警告提示", "请注意检查"),
+            "Error" => ("错误报告", "操作失败，请重试"),
+            _ => ("测试通知", "这是一条测试通知")
+        };
+
+        // Create notification content with specified duration
+        var content = new NotificationContent(
+            Title: title,
+            Message: message,
+            Severity: Enum.Parse<NotificationSeverity>(severity),
+            Position: position,
+            Duration: TimeSpan.FromSeconds(TestDurationSeconds));
+
+        // Use Show method which will automatically route to dialog or toast based on position
+        App.CurrentNotificationService?.Show(content);
+    }
+}

LanMountainDesktop/ViewModels/NotificationViewModel.cs

@@ -0,0 +1,38 @@
+using System;
+using Avalonia.Media.Imaging;
+using CommunityToolkit.Mvvm.ComponentModel;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.ViewModels;
+
+public partial class NotificationViewModel : ViewModelBase
+{
+    [ObservableProperty] private string _title = string.Empty;
+    [ObservableProperty] private string? _message;
+    [ObservableProperty] private Bitmap? _icon;
+    [ObservableProperty] private NotificationSeverity _severity;
+    [ObservableProperty] private NotificationPosition _position;
+    [ObservableProperty] private bool _isClosing;
+    
+    public TimeSpan Duration { get; set; } = TimeSpan.FromSeconds(4);
+    public Action? OnClick { get; set; }
+    public Guid Id { get; } = Guid.NewGuid();
+
+    public string SeverityIcon =>
+        Severity switch
+        {
+            NotificationSeverity.Success => "CheckmarkCircle",
+            NotificationSeverity.Warning => "Warning",
+            NotificationSeverity.Error => "DismissCircle",
+            _ => "Info"
+        };
+
+    public string SeverityColorResource =>
+        Severity switch
+        {
+            NotificationSeverity.Success => "SystemFillColorSuccessBrush",
+            NotificationSeverity.Warning => "SystemFillColorCautionBrush",
+            NotificationSeverity.Error => "SystemFillColorCriticalBrush",
+            _ => "SystemFillColorAttentionBrush"
+        };
+}

LanMountainDesktop/ViewModels/SettingsViewModels.cs

@@ -2328,13 +2328,27 @@ public sealed partial class StudySettingsPageViewModel : ViewModelBase
     private readonly LocalizationService _localizationService = new();
     private readonly string _languageCode;
     private bool _isInitializing;
-    private readonly IStudyAnalyticsService _studyAnalyticsService = StudyAnalyticsServiceFactory.CreateDefault();
+    private readonly IStudyAnalyticsService _studyAnalyticsService;
 
-    public StudySettingsPageViewModel(ISettingsFacadeService settingsFacade)
+    // 防抖计时器
+    private System.Timers.Timer? _noiseSettingsDebounceTimer;
+    private System.Timers.Timer? _timerSettingsDebounceTimer;
+    private System.Timers.Timer? _alertSettingsDebounceTimer;
+    private System.Timers.Timer? _displaySettingsDebounceTimer;
+    private bool _hasPendingNoiseSave;
+    private bool _hasPendingTimerSave;
+    private bool _hasPendingAlertSave;
+    private bool _hasPendingDisplaySave;
+
+    public StudySettingsPageViewModel(ISettingsFacadeService settingsFacade, IStudyAnalyticsService? studyAnalyticsService = null)
     {
         _settingsFacade = settingsFacade ?? throw new ArgumentNullException(nameof(settingsFacade));
+        _studyAnalyticsService = studyAnalyticsService ?? StudyAnalyticsServiceFactory.CreateDefault();
         _languageCode = _localizationService.NormalizeLanguageCode(_settingsFacade.Region.Get().LanguageCode);
 
+        // 初始化防抖计时器
+        InitializeDebounceTimers();
+
         RefreshLocalizedText();
 
         _isInitializing = true;
@@ -2342,6 +2356,21 @@ public sealed partial class StudySettingsPageViewModel : ViewModelBase
         _isInitializing = false;
     }
 
+    private void InitializeDebounceTimers()
+    {
+        _noiseSettingsDebounceTimer = new System.Timers.Timer(500) { AutoReset = false };
+        _noiseSettingsDebounceTimer.Elapsed += async (s, e) => await SaveNoiseSettingsDebounced();
+
+        _timerSettingsDebounceTimer = new System.Timers.Timer(500) { AutoReset = false };
+        _timerSettingsDebounceTimer.Elapsed += async (s, e) => await SaveTimerSettingsDebounced();
+
+        _alertSettingsDebounceTimer = new System.Timers.Timer(500) { AutoReset = false };
+        _alertSettingsDebounceTimer.Elapsed += async (s, e) => await SaveAlertSettingsDebounced();
+
+        _displaySettingsDebounceTimer = new System.Timers.Timer(500) { AutoReset = false };
+        _displaySettingsDebounceTimer.Elapsed += async (s, e) => await SaveDisplaySettingsDebounced();
+    }
+
     #region Properties - Master Switch
 
     [ObservableProperty]
@@ -2361,6 +2390,21 @@ public sealed partial class StudySettingsPageViewModel : ViewModelBase
         }
     }
 
+    private void SaveMasterSwitch()
+    {
+        try
+        {
+            var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
+            appSnapshot.StudyEnabled = StudyEnabled;
+            _settingsFacade.Settings.SaveSnapshot(SettingsScope.App, appSnapshot,
+                changedKeys: [nameof(AppSettingsSnapshot.StudyEnabled)]);
+        }
+        catch (Exception)
+        {
+            // 静默处理错误，避免影响用户体验
+        }
+    }
+
     #endregion
 
     #region Properties - Noise Monitoring
@@ -2400,20 +2444,34 @@ public sealed partial class StudySettingsPageViewModel : ViewModelBase
 
     partial void OnNoiseSensitivityDbfsChanged(double value)
     {
+        // 输入验证：限制在合理范围内
+        if (value < -70 || value > -35)
+        {
+            NoiseSensitivityDbfs = Math.Clamp(value, -70, -35);
+            return;
+        }
+
         UpdateSensitivityText();
         UpdateThresholdText();
         if (!_isInitializing)
         {
-            SaveNoiseSettings();
+            DebounceNoiseSettingsSave();
         }
     }
 
     partial void OnSamplingRateMsChanged(int value)
     {
+        // 输入验证：限制在合理范围内
+        if (value < 20 || value > 200)
+        {
+            SamplingRateMs = Math.Clamp(value, 20, 200);
+            return;
+        }
+
         UpdateSamplingRateText();
         if (!_isInitializing)
         {
-            SaveNoiseSettings();
+            DebounceNoiseSettingsSave();
         }
     }
 
@@ -2427,6 +2485,34 @@ public sealed partial class StudySettingsPageViewModel : ViewModelBase
         NoiseSensitivityValueText = $"{NoiseSensitivityDbfs:F0} dBFS";
     }
 
+    private void DebounceNoiseSettingsSave()
+    {
+        _hasPendingNoiseSave = true;
+        _noiseSettingsDebounceTimer?.Stop();
+        _noiseSettingsDebounceTimer?.Start();
+    }
+
+    private async Task SaveNoiseSettingsDebounced()
+    {
+        if (!_hasPendingNoiseSave) return;
+        _hasPendingNoiseSave = false;
+
+        try
+        {
+            var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
+            appSnapshot.StudyFrameMs = SamplingRateMs;
+            appSnapshot.StudyScoreThresholdDbfs = NoiseSensitivityDbfs;
+            _settingsFacade.Settings.SaveSnapshot(SettingsScope.App, appSnapshot,
+                changedKeys: [nameof(AppSettingsSnapshot.StudyFrameMs), nameof(AppSettingsSnapshot.StudyScoreThresholdDbfs)]);
+            UpdateThresholdText();
+            UpdateStudyAnalyticsConfig();
+        }
+        catch (Exception)
+        {
+            // 静默处理错误
+        }
+    }
+
     #endregion
 
     #region Properties - Focus Timer
@@ -2505,37 +2591,65 @@ public sealed partial class StudySettingsPageViewModel : ViewModelBase
 
     partial void OnFocusDurationMinutesChanged(int value)
     {
+        // 输入验证
+        if (value < 5 || value > 90)
+        {
+            FocusDurationMinutes = Math.Clamp(value, 5, 90);
+            return;
+        }
+
         UpdateFocusDurationText();
         if (!_isInitializing)
         {
-            SaveTimerSettings();
+            DebounceTimerSettingsSave();
         }
     }
 
     partial void OnBreakDurationMinutesChanged(int value)
     {
+        // 输入验证
+        if (value < 1 || value > 30)
+        {
+            BreakDurationMinutes = Math.Clamp(value, 1, 30);
+            return;
+        }
+
         UpdateBreakDurationText();
         if (!_isInitializing)
         {
-            SaveTimerSettings();
+            DebounceTimerSettingsSave();
         }
     }
 
     partial void OnLongBreakDurationMinutesChanged(int value)
     {
+        // 输入验证
+        if (value < 5 || value > 60)
+        {
+            LongBreakDurationMinutes = Math.Clamp(value, 5, 60);
+            return;
+        }
+
         UpdateLongBreakDurationText();
         if (!_isInitializing)
         {
-            SaveTimerSettings();
+            DebounceTimerSettingsSave();
         }
     }
 
     partial void OnSessionsBeforeLongBreakChanged(int value)
     {
+        // 输入验证
+        if (value < 2 || value > 8)
+        {
+            SessionsBeforeLongBreak = Math.Clamp(value, 2, 8);
+            return;
+        }
+
         UpdateSessionsBeforeLongBreakText();
         if (!_isInitializing)
         {
-            SaveTimerSettings();
+            DebounceTimerSettingsSave();
         }
     }
 
@@ -2543,7 +2657,7 @@ public sealed partial class StudySettingsPageViewModel : ViewModelBase
     {
         if (!_isInitializing)
         {
-            SaveTimerSettings();
+            DebounceTimerSettingsSave();
         }
     }
 
@@ -2551,28 +2665,69 @@ public sealed partial class StudySettingsPageViewModel : ViewModelBase
     {
         if (!_isInitializing)
         {
-            SaveTimerSettings();
+            DebounceTimerSettingsSave();
         }
     }
 
     private void UpdateFocusDurationText()
     {
-        FocusDurationValueText = $"{FocusDurationMinutes} 分钟";
+        var unit = L("common.unit.minutes", "分钟");
+        FocusDurationValueText = $"{FocusDurationMinutes} {unit}";
     }
 
     private void UpdateBreakDurationText()
     {
-        BreakDurationValueText = $"{BreakDurationMinutes} 分钟";
+        var unit = L("common.unit.minutes", "分钟");
+        BreakDurationValueText = $"{BreakDurationMinutes} {unit}";
     }
 
     private void UpdateLongBreakDurationText()
     {
-        LongBreakDurationValueText = $"{LongBreakDurationMinutes} 分钟";
+        var unit = L("common.unit.minutes", "分钟");
+        LongBreakDurationValueText = $"{LongBreakDurationMinutes} {unit}";
     }
 
     private void UpdateSessionsBeforeLongBreakText()
     {
-        SessionsBeforeLongBreakValueText = $"{SessionsBeforeLongBreak} 次";
+        var unit = L("common.unit.times", "次");
+        SessionsBeforeLongBreakValueText = $"{SessionsBeforeLongBreak} {unit}";
+    }
+
+    private void DebounceTimerSettingsSave()
+    {
+        _hasPendingTimerSave = true;
+        _timerSettingsDebounceTimer?.Stop();
+        _timerSettingsDebounceTimer?.Start();
+    }
+
+    private async Task SaveTimerSettingsDebounced()
+    {
+        if (!_hasPendingTimerSave) return;
+        _hasPendingTimerSave = false;
+
+        try
+        {
+            var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
+            appSnapshot.StudyFocusDurationMinutes = FocusDurationMinutes;
+            appSnapshot.StudyBreakDurationMinutes = BreakDurationMinutes;
+            appSnapshot.StudyLongBreakDurationMinutes = LongBreakDurationMinutes;
+            appSnapshot.StudySessionsBeforeLongBreak = SessionsBeforeLongBreak;
+            appSnapshot.StudyAutoStartBreak = AutoStartBreak;
+            appSnapshot.StudyAutoStartFocus = AutoStartFocus;
+            _settingsFacade.Settings.SaveSnapshot(SettingsScope.App, appSnapshot,
+                changedKeys: [
+                    nameof(AppSettingsSnapshot.StudyFocusDurationMinutes),
+                    nameof(AppSettingsSnapshot.StudyBreakDurationMinutes),
+                    nameof(AppSettingsSnapshot.StudyLongBreakDurationMinutes),
+                    nameof(AppSettingsSnapshot.StudySessionsBeforeLongBreak),
+                    nameof(AppSettingsSnapshot.StudyAutoStartBreak),
+                    nameof(AppSettingsSnapshot.StudyAutoStartFocus)
+                ]);
+        }
+        catch (Exception)
+        {
+            // 静默处理错误
+        }
     }
 
     #endregion
@@ -2607,15 +2762,49 @@ public sealed partial class StudySettingsPageViewModel : ViewModelBase
     {
         if (!_isInitializing)
         {
-            SaveAlertSettings();
+            DebounceAlertSettingsSave();
         }
     }
 
     partial void OnMaxInterruptsPerMinuteChanged(int value)
     {
+        // 输入验证
+        if (value < 3 || value > 20)
+        {
+            MaxInterruptsPerMinute = Math.Clamp(value, 3, 20);
+            return;
+        }
+
         if (!_isInitializing)
         {
-            SaveAlertSettings();
+            DebounceAlertSettingsSave();
+        }
+    }
+
+    private void DebounceAlertSettingsSave()
+    {
+        _hasPendingAlertSave = true;
+        _alertSettingsDebounceTimer?.Stop();
+        _alertSettingsDebounceTimer?.Start();
+    }
+
+    private async Task SaveAlertSettingsDebounced()
+    {
+        if (!_hasPendingAlertSave) return;
+        _hasPendingAlertSave = false;
+
+        try
+        {
+            var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
+            appSnapshot.StudyNoiseAlertEnabled = NoiseAlertEnabled;
+            appSnapshot.StudyMaxInterruptsPerMinute = MaxInterruptsPerMinute;
+            _settingsFacade.Settings.SaveSnapshot(SettingsScope.App, appSnapshot,
+                changedKeys: [nameof(AppSettingsSnapshot.StudyNoiseAlertEnabled), nameof(AppSettingsSnapshot.StudyMaxInterruptsPerMinute)]);
+            UpdateStudyAnalyticsConfig();
+        }
+        catch (Exception)
+        {
+            // 静默处理错误
         }
     }
 
@@ -2666,25 +2855,39 @@ public sealed partial class StudySettingsPageViewModel : ViewModelBase
     {
         if (!_isInitializing)
         {
-            SaveDisplaySettings();
+            DebounceDisplaySettingsSave();
         }
     }
 
     partial void OnBaselineDbChanged(double value)
     {
+        // 输入验证
+        if (value < 20 || value > 90)
+        {
+            BaselineDb = Math.Clamp(value, 20, 90);
+            return;
+        }
+
         UpdateBaselineDbText();
         if (!_isInitializing)
         {
-            SaveDisplaySettings();
+            DebounceDisplaySettingsSave();
         }
     }
 
     partial void OnAvgWindowSecChanged(int value)
     {
+        // 输入验证
+        if (value < 1 || value > 8)
+        {
+            AvgWindowSec = Math.Clamp(value, 1, 8);
+            return;
+        }
+
         UpdateAvgWindowSecText();
         if (!_isInitializing)
         {
-            SaveDisplaySettings();
+            DebounceDisplaySettingsSave();
         }
     }
 
@@ -2700,14 +2903,45 @@ public sealed partial class StudySettingsPageViewModel : ViewModelBase
 
     private void UpdateAvgWindowSecText()
     {
-        AvgWindowSecValueText = $"{AvgWindowSec} 秒";
+        var unit = L("common.unit.seconds", "秒");
+        AvgWindowSecValueText = $"{AvgWindowSec} {unit}";
+    }
+
+    private void DebounceDisplaySettingsSave()
+    {
+        _hasPendingDisplaySave = true;
+        _displaySettingsDebounceTimer?.Stop();
+        _displaySettingsDebounceTimer?.Start();
+    }
+
+    private async Task SaveDisplaySettingsDebounced()
+    {
+        if (!_hasPendingDisplaySave) return;
+        _hasPendingDisplaySave = false;
+
+        try
+        {
+            var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
+            appSnapshot.StudyShowRealtimeDb = ShowRealtimeDb;
+            appSnapshot.StudyBaselineDb = BaselineDb;
+            appSnapshot.StudyAvgWindowSec = AvgWindowSec;
+            _settingsFacade.Settings.SaveSnapshot(SettingsScope.App, appSnapshot,
+                changedKeys: [nameof(AppSettingsSnapshot.StudyShowRealtimeDb), nameof(AppSettingsSnapshot.StudyBaselineDb), nameof(AppSettingsSnapshot.StudyAvgWindowSec)]);
+            UpdateStudyAnalyticsConfig();
+        }
+        catch (Exception)
+        {
+            // 静默处理错误
+        }
     }
 
     private void LoadSettings()
+    {
+        try
         {
             var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
 
-        // Master switch
+            // Master switch - 确保正确加载保存的值
             StudyEnabled = appSnapshot.StudyEnabled;
 
             // Noise settings
@@ -2741,65 +2975,24 @@ public sealed partial class StudySettingsPageViewModel : ViewModelBase
             UpdateBaselineDbText();
             UpdateAvgWindowSecText();
         }
-
-    private void SaveMasterSwitch()
+        catch (Exception)
         {
-        var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
-        appSnapshot.StudyEnabled = StudyEnabled;
-        _settingsFacade.Settings.SaveSnapshot(SettingsScope.App, appSnapshot,
-            changedKeys: [nameof(AppSettingsSnapshot.StudyEnabled)]);
+            // 加载失败时使用默认值
+            StudyEnabled = true;
+            SamplingRateMs = 50;
+            NoiseSensitivityDbfs = -50;
+            FocusDurationMinutes = 25;
+            BreakDurationMinutes = 5;
+            LongBreakDurationMinutes = 15;
+            SessionsBeforeLongBreak = 4;
+            AutoStartBreak = false;
+            AutoStartFocus = false;
+            NoiseAlertEnabled = false;
+            MaxInterruptsPerMinute = 6;
+            ShowRealtimeDb = true;
+            BaselineDb = 45;
+            AvgWindowSec = 1;
         }
-
-    private void SaveNoiseSettings()
-    {
-        var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
-        appSnapshot.StudyFrameMs = SamplingRateMs;
-        appSnapshot.StudyScoreThresholdDbfs = NoiseSensitivityDbfs;
-        _settingsFacade.Settings.SaveSnapshot(SettingsScope.App, appSnapshot,
-            changedKeys: [nameof(AppSettingsSnapshot.StudyFrameMs), nameof(AppSettingsSnapshot.StudyScoreThresholdDbfs)]);
-        UpdateThresholdText();
-        UpdateStudyAnalyticsConfig();
-    }
-
-    private void SaveTimerSettings()
-    {
-        var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
-        appSnapshot.StudyFocusDurationMinutes = FocusDurationMinutes;
-        appSnapshot.StudyBreakDurationMinutes = BreakDurationMinutes;
-        appSnapshot.StudyLongBreakDurationMinutes = LongBreakDurationMinutes;
-        appSnapshot.StudySessionsBeforeLongBreak = SessionsBeforeLongBreak;
-        appSnapshot.StudyAutoStartBreak = AutoStartBreak;
-        appSnapshot.StudyAutoStartFocus = AutoStartFocus;
-        _settingsFacade.Settings.SaveSnapshot(SettingsScope.App, appSnapshot,
-            changedKeys: [
-                nameof(AppSettingsSnapshot.StudyFocusDurationMinutes),
-                nameof(AppSettingsSnapshot.StudyBreakDurationMinutes),
-                nameof(AppSettingsSnapshot.StudyLongBreakDurationMinutes),
-                nameof(AppSettingsSnapshot.StudySessionsBeforeLongBreak),
-                nameof(AppSettingsSnapshot.StudyAutoStartBreak),
-                nameof(AppSettingsSnapshot.StudyAutoStartFocus)
-            ]);
-    }
-
-    private void SaveAlertSettings()
-    {
-        var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
-        appSnapshot.StudyNoiseAlertEnabled = NoiseAlertEnabled;
-        appSnapshot.StudyMaxInterruptsPerMinute = MaxInterruptsPerMinute;
-        _settingsFacade.Settings.SaveSnapshot(SettingsScope.App, appSnapshot,
-            changedKeys: [nameof(AppSettingsSnapshot.StudyNoiseAlertEnabled), nameof(AppSettingsSnapshot.StudyMaxInterruptsPerMinute)]);
-        UpdateStudyAnalyticsConfig();
-    }
-
-    private void SaveDisplaySettings()
-    {
-        var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
-        appSnapshot.StudyShowRealtimeDb = ShowRealtimeDb;
-        appSnapshot.StudyBaselineDb = BaselineDb;
-        appSnapshot.StudyAvgWindowSec = AvgWindowSec;
-        _settingsFacade.Settings.SaveSnapshot(SettingsScope.App, appSnapshot,
-            changedKeys: [nameof(AppSettingsSnapshot.StudyShowRealtimeDb), nameof(AppSettingsSnapshot.StudyBaselineDb), nameof(AppSettingsSnapshot.StudyAvgWindowSec)]);
-        UpdateStudyAnalyticsConfig();
     }
 
     private void UpdateStudyAnalyticsConfig()

LanMountainDesktop/Views/Components/ClassScheduleWidget.axaml.cs

@@ -44,12 +44,18 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
     private TimeZoneService? _timeZoneService;
     private double _currentCellSize = 48;
     private IReadOnlyList<CourseItemViewModel> _courseItems = Array.Empty<CourseItemViewModel>();
+    private IReadOnlyList<CourseItemViewModel> _lastRenderedItems = Array.Empty<CourseItemViewModel>();
     private bool _isNightVisual = true;
     private string _languageCode = "zh-CN";
     private string _componentId = BuiltInComponentIds.DesktopClassSchedule;
     private string _placementId = string.Empty;
     private string? _componentColorScheme;
 
+    private ClassIslandScheduleReadResult? _cachedScheduleResult;
+    private string? _lastLoadedSchedulePath;
+    private DateTime _lastScheduleLoadTime = DateTime.MinValue;
+    private static readonly TimeSpan ScheduleCacheDuration = TimeSpan.FromMinutes(5);
+
     public ClassScheduleWidget()
     {
         InitializeComponent();
@@ -118,6 +124,7 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
 
     private void OnTimeZoneChanged(object? sender, EventArgs e)
     {
+        InvalidateScheduleCache();
         RefreshSchedule();
     }
 
@@ -159,7 +166,14 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
 
         var previousCourseIndex = _lastCurrentCourseIndex;
 
+        if (ShouldRefreshOnTimerTick(now, currentDate))
+        {
             RefreshSchedule();
+        }
+        else
+        {
+            UpdateCurrentCourseState(now);
+        }
 
         var newCurrentCourseIndex = FindCurrentCourseIndex();
         _lastCurrentCourseIndex = newCurrentCourseIndex;
@@ -179,6 +193,61 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
         }
     }
 
+    private bool ShouldRefreshOnTimerTick(DateTime now, DateOnly currentDate)
+    {
+        if (_lastRefreshDate != currentDate)
+        {
+            return true;
+        }
+
+        if (_courseItems.Count == 0)
+        {
+            return true;
+        }
+
+        foreach (var item in _courseItems)
+        {
+            if (item.IsCurrent)
+            {
+                var currentTime = now.TimeOfDay;
+                if (currentTime.TotalSeconds < 30 || currentTime.TotalSeconds > 86970)
+                {
+                    return true;
+                }
+                break;
+            }
+        }
+
+        return false;
+    }
+
+    private void UpdateCurrentCourseState(DateTime now)
+    {
+        bool needsRender = false;
+        for (var i = 0; i < _courseItems.Count; i++)
+        {
+            var item = _courseItems[i];
+            var timeParts = item.TimeRange.Split('-');
+            if (timeParts.Length != 2) continue;
+
+            if (TimeSpan.TryParse(timeParts[0].Trim(), out var startTime) &&
+                TimeSpan.TryParse(timeParts[1].Trim(), out var endTime))
+            {
+                var shouldBeCurrent = now.TimeOfDay >= startTime && now.TimeOfDay <= endTime;
+                if (shouldBeCurrent != item.IsCurrent)
+                {
+                    needsRender = true;
+                    break;
+                }
+            }
+        }
+
+        if (needsRender)
+        {
+            RefreshSchedule();
+        }
+    }
+
     private int FindCurrentCourseIndex()
     {
         for (var i = 0; i < _courseItems.Count; i++)
@@ -198,7 +267,6 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
             return;
         }
 
-        // 确保在UI线程执行
         Avalonia.Threading.Dispatcher.UIThread.Post(() =>
         {
             if (courseIndex >= CourseListPanel.Children.Count)
@@ -216,10 +284,8 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
             var scrollViewerHeight = ContentScrollViewer.Bounds.Height;
             var contentHeight = CourseListPanel.Bounds.Height;
 
-            // 计算滚动位置，使当前课程居中显示
             var targetOffset = bounds.Position.Y - (scrollViewerHeight / 2) + (bounds.Height / 2);
 
-            // 确保不超出边界
             targetOffset = Math.Max(0, Math.Min(targetOffset, contentHeight - scrollViewerHeight));
 
             ContentScrollViewer.Offset = new Vector(0, targetOffset);
@@ -228,6 +294,7 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
 
     public void RefreshFromSettings()
     {
+        InvalidateScheduleCache();
         RefreshSchedule();
     }
 
@@ -237,9 +304,46 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
             ? BuiltInComponentIds.DesktopClassSchedule
             : componentId.Trim();
         _placementId = placementId?.Trim() ?? string.Empty;
+        InvalidateScheduleCache();
         RefreshSchedule();
     }
 
+    private void InvalidateScheduleCache()
+    {
+        _cachedScheduleResult = null;
+        _lastLoadedSchedulePath = null;
+        _lastScheduleLoadTime = DateTime.MinValue;
+    }
+
+    private ClassIslandScheduleReadResult LoadScheduleWithCache(
+        string? path,
+        DateOnly? semesterStartDate,
+        int semesterWeekCycle)
+    {
+        if (!string.IsNullOrEmpty(path) &&
+            _cachedScheduleResult != null &&
+            _lastLoadedSchedulePath == path &&
+            (DateTime.Now - _lastScheduleLoadTime) < ScheduleCacheDuration)
+        {
+            return _cachedScheduleResult;
+        }
+
+        var result = _scheduleService.Load(
+            path,
+            profileFileName: null,
+            semesterStartDate: semesterStartDate,
+            semesterWeekCycle: semesterWeekCycle);
+
+        if (result.Success)
+        {
+            _cachedScheduleResult = result;
+            _lastLoadedSchedulePath = path;
+            _lastScheduleLoadTime = DateTime.Now;
+        }
+
+        return result;
+    }
+
     private void RefreshSchedule()
     {
         var appSettings = _settingsService.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
@@ -253,17 +357,21 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
         var today = DateOnly.FromDateTime(now);
 
         var importedSchedulePath = ResolveImportedSchedulePath(componentSettings);
-        var readResult = _scheduleService.Load(
+        var readResult = LoadScheduleWithCache(
             importedSchedulePath,
-            profileFileName: null,
-            semesterStartDate: componentSettings.SemesterStartDate,
-            semesterWeekCycle: componentSettings.SemesterWeekCycle);
+            componentSettings.SemesterStartDate,
+            componentSettings.SemesterWeekCycle);
+
         if (!readResult.Success || readResult.Snapshot is null)
         {
-            _courseItems = Array.Empty<CourseItemViewModel>();
+            var newItems = Array.Empty<CourseItemViewModel>();
+            if (!IsDataEqual(_courseItems, newItems))
+            {
+                _courseItems = newItems;
                 UpdateHeader(now);
                 ShowStatus(L("schedule.widget.no_source", "未读取到 ClassIsland 课表"));
                 RenderScheduleItems();
+            }
             return;
         }
 
@@ -279,27 +387,35 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
             }
             else
             {
-                _courseItems = Array.Empty<CourseItemViewModel>();
+                var newItems = Array.Empty<CourseItemViewModel>();
+                if (!IsDataEqual(_courseItems, newItems))
+                {
+                    _courseItems = newItems;
                     UpdateHeader(now);
                     ShowStatus(L("schedule.widget.no_class_today", "今天没有课程"));
                     RenderScheduleItems();
+                }
                 return;
             }
         }
 
         if (!snapshot.TimeLayouts.TryGetValue(resolvedClassPlan.ClassPlan.TimeLayoutId, out var layout))
         {
-            _courseItems = Array.Empty<CourseItemViewModel>();
+            var newItems = Array.Empty<CourseItemViewModel>();
+            if (!IsDataEqual(_courseItems, newItems))
+            {
+                _courseItems = newItems;
                 UpdateHeader(now);
                 ShowStatus(L("schedule.widget.layout_missing", "课表时间布局缺失"));
                 RenderScheduleItems();
+            }
             return;
         }
 
         var adjustedNow = today == DateOnly.FromDateTime(now) ? now : DateTime.Today.AddHours(8);
-        _courseItems = BuildCourseItemViewModels(snapshot, resolvedClassPlan.ClassPlan, layout, adjustedNow);
+        var newCourseItems = BuildCourseItemViewModels(snapshot, resolvedClassPlan.ClassPlan, layout, adjustedNow);
 
-        if (_courseItems.Count == 0)
+        if (newCourseItems.Count == 0)
         {
             var nextDay = today.AddDays(1);
             if (_scheduleService.TryResolveClassPlanForDate(snapshot, nextDay, out var nextDayClassPlan) &&
@@ -307,23 +423,31 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
             {
                 today = nextDay;
                 adjustedNow = DateTime.Today.AddHours(8);
-                _courseItems = BuildCourseItemViewModels(snapshot, nextDayClassPlan.ClassPlan, nextLayout, adjustedNow);
+                newCourseItems = BuildCourseItemViewModels(snapshot, nextDayClassPlan.ClassPlan, nextLayout, adjustedNow);
             }
         }
 
         UpdateHeader(today.ToDateTime(TimeOnly.MinValue));
 
-        if (_courseItems.Count == 0)
+        if (newCourseItems.Count == 0)
         {
+            if (!IsDataEqual(_courseItems, newCourseItems))
+            {
+                _courseItems = newCourseItems;
                 ShowStatus(L("schedule.widget.no_class_today", "今天没有课程"));
+                RenderScheduleItems();
+            }
         }
         else
         {
+            var dataChanged = !IsDataEqual(_courseItems, newCourseItems);
+            if (dataChanged)
+            {
+                _courseItems = newCourseItems;
                 var currentIndex = FindCurrentCourseIndex();
                 _lastCurrentCourseIndex = currentIndex;
                 HideStatus();
 
-            // 初始化时自动跳转到当前课程
                 if (currentIndex >= 0)
                 {
                     Avalonia.Threading.Dispatcher.UIThread.Post(() =>
@@ -331,10 +455,44 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
                         ScrollToCurrentCourse(currentIndex);
                     }, Avalonia.Threading.DispatcherPriority.Loaded);
                 }
-        }
 
                 RenderScheduleItems();
             }
+            else
+            {
+                var currentIndex = FindCurrentCourseIndex();
+                if (currentIndex != _lastCurrentCourseIndex)
+                {
+                    _lastCurrentCourseIndex = currentIndex;
+                    IncrementalUpdateCurrentCourseHighlight(currentIndex);
+                }
+            }
+        }
+    }
+
+    private static bool IsDataEqual(IReadOnlyList<CourseItemViewModel> oldItems, IReadOnlyList<CourseItemViewModel> newItems)
+    {
+        if (oldItems.Count != newItems.Count)
+        {
+            return false;
+        }
+
+        for (var i = 0; i < oldItems.Count; i++)
+        {
+            var oldItem = oldItems[i];
+            var newItem = newItems[i];
+
+            if (oldItem.Name != newItem.Name ||
+                oldItem.TimeRange != newItem.TimeRange ||
+                oldItem.Detail != newItem.Detail ||
+                oldItem.IsCurrent != newItem.IsCurrent)
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
 
     private IReadOnlyList<CourseItemViewModel> BuildCourseItemViewModels(
         ClassIslandScheduleSnapshot snapshot,
@@ -487,13 +645,35 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
 
     private void RenderScheduleItems()
     {
-        CourseListPanel.Children.Clear();
         ClassCountTextBlock.Text = FormatClassCount(_courseItems.Count);
+
         if (_courseItems.Count == 0)
         {
+            if (CourseListPanel.Children.Count > 0)
+            {
+                CourseListPanel.Children.Clear();
+            }
             return;
         }
 
+        var needsFullRebuild = CourseListPanel.Children.Count != _courseItems.Count;
+
+        if (needsFullRebuild)
+        {
+            RebuildAllItems();
+        }
+        else
+        {
+            IncrementalUpdateItems();
+        }
+
+        _lastRenderedItems = _courseItems.ToList();
+    }
+
+    private void RebuildAllItems()
+    {
+        CourseListPanel.Children.Clear();
+
         var useMonetColor = ComponentColorSchemeHelper.ShouldUseMonetColor(
             _componentColorScheme,
             ComponentColorSchemeHelper.GetCurrentGlobalThemeColorMode());
@@ -508,7 +688,6 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
             Math.Clamp(4 * scale, 2, 8),
             Math.Clamp(4 * scale, 2, 8),
             Math.Clamp(4 * scale, 2, 8));
-        var maxVisibleItems = ResolveMaxVisibleItems(scale);
 
         var primaryBrush = CreateBrush(_isNightVisual ? "#F9FBFF" : "#151821");
         var secondaryBrush = CreateBrush(_isNightVisual ? "#848B99" : "#667084");
@@ -520,8 +699,108 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
         for (var i = 0; i < _courseItems.Count; i++)
         {
             var item = _courseItems[i];
-            var bulletBrush = item.IsCurrent ? currentBrush : normalBulletBrush;
+            var itemControls = CreateSingleItemControl(
+                item,
+                scale,
+                bulletSize,
+                courseNameSize,
+                secondarySize,
+                lineSpacing,
+                itemPadding,
+                primaryBrush,
+                secondaryBrush,
+                item.IsCurrent ? currentBrush : normalBulletBrush);
 
+            CourseListPanel.Children.Add(itemControls);
+        }
+    }
+
+    private void IncrementalUpdateItems()
+    {
+        var useMonetColor = ComponentColorSchemeHelper.ShouldUseMonetColor(
+            _componentColorScheme,
+            ComponentColorSchemeHelper.GetCurrentGlobalThemeColorMode());
+
+        var currentBrush = useMonetColor
+            ? CreateBrush("#FF4FC3F7")
+            : CreateBrush("#FF4D5A");
+        var normalBulletBrush = CreateBrush(_isNightVisual ? "#B8BEC9" : "#9AA3B2");
+
+        for (var i = 0; i < _courseItems.Count && i < CourseListPanel.Children.Count; i++)
+        {
+            var item = _courseItems[i];
+            var existingBorder = CourseListPanel.Children[i] as Border;
+            if (existingBorder == null) continue;
+
+            var existingGrid = existingBorder.Child as Grid;
+            if (existingGrid == null || existingGrid.Children.Count < 2) continue;
+
+            var bulletBorder = existingGrid.Children[0] as Border;
+            var textStack = existingGrid.Children[1] as StackPanel;
+            if (bulletBorder == null || textStack == null || textStack.Children.Count < 3) continue;
+
+            var newBulletBrush = item.IsCurrent ? currentBrush : normalBulletBrush;
+            bulletBorder.Background = newBulletBrush;
+
+            var titleText = textStack.Children[0] as TextBlock;
+            var timeText = textStack.Children[1] as TextBlock;
+            var detailText = textStack.Children[2] as TextBlock;
+
+            if (titleText != null && titleText.Text != item.Name)
+            {
+                titleText.Text = item.Name;
+            }
+
+            if (timeText != null && timeText.Text != item.TimeRange)
+            {
+                timeText.Text = item.TimeRange;
+            }
+
+            if (detailText != null && detailText.Text != item.Detail)
+            {
+                detailText.Text = item.Detail;
+            }
+        }
+    }
+
+    private void IncrementalUpdateCurrentCourseHighlight(int currentCourseIndex)
+    {
+        var useMonetColor = ComponentColorSchemeHelper.ShouldUseMonetColor(
+            _componentColorScheme,
+            ComponentColorSchemeHelper.GetCurrentGlobalThemeColorMode());
+
+        var currentBrush = useMonetColor
+            ? CreateBrush("#FF4FC3F7")
+            : CreateBrush("#FF4D5A");
+        var normalBulletBrush = CreateBrush(_isNightVisual ? "#B8BEC9" : "#9AA3B2");
+
+        for (var i = 0; i < CourseListPanel.Children.Count; i++)
+        {
+            var border = CourseListPanel.Children[i] as Border;
+            if (border == null) continue;
+
+            var grid = border.Child as Grid;
+            if (grid == null || grid.Children.Count < 2) continue;
+
+            var bulletBorder = grid.Children[0] as Border;
+            if (bulletBorder == null) continue;
+
+            bulletBorder.Background = i == currentCourseIndex ? currentBrush : normalBulletBrush;
+        }
+    }
+
+    private Border CreateSingleItemControl(
+        CourseItemViewModel item,
+        double scale,
+        double bulletSize,
+        double courseNameSize,
+        double secondarySize,
+        double lineSpacing,
+        Thickness itemPadding,
+        IBrush primaryBrush,
+        IBrush secondaryBrush,
+        IBrush bulletBrush)
+    {
         var bullet = new Border
         {
             Width = bulletSize,
@@ -584,8 +863,7 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
             Child = itemGrid
         };
 
-            CourseListPanel.Children.Add(itemBorder);
-        }
+        return itemBorder;
     }
 
     private int ResolveMaxVisibleItems(double scale)
@@ -702,7 +980,7 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
         var r = ToLinear(color.R / 255d);
         var g = ToLinear(color.G / 255d);
         var b = ToLinear(color.B / 255d);
-        return 0.2126 * r + 0.7152 * g + 0.0722 * b;
+        return 0.2126 * r + 0.7155 * g + 0.0722 * b;
     }
 
     private static FontWeight ToVariableWeight(double value)

LanMountainDesktop/Views/Components/StudyInterruptDensityWidget.axaml.cs

@@ -55,6 +55,11 @@ public partial class StudyInterruptDensityWidget : UserControl, IDesktopComponen
     private string _languageCode = "zh-CN";
     private IDisposable? _monitoringLease;
 
+    // 通知相关字段
+    private DateTime _lastAlertTime = DateTime.MinValue;
+    private readonly TimeSpan _alertCooldown = TimeSpan.FromMinutes(2); // 2分钟冷却时间
+    private DensityLevelKind _lastLevelKind = DensityLevelKind.Calm;
+
     private enum DensityLevelKind
     {
         Calm = 0,
@@ -227,6 +232,9 @@ public partial class StudyInterruptDensityWidget : UserControl, IDesktopComponen
             CultureInfo.InvariantCulture,
             L("study.interrupt_density.threshold_format", "Threshold {0:F1}/min"),
             m.ThresholdPerMin);
+
+        // 检查并发送通知
+        CheckAndSendAlert(m, snapshot.Config);
     }
 
     private void ApplyLocalizedLabels()
@@ -687,4 +695,75 @@ public partial class StudyInterruptDensityWidget : UserControl, IDesktopComponen
     {
         return _localizationService.GetString(_languageCode, key, fallback);
     }
+
+    private void CheckAndSendAlert(InterruptDensityMetrics metrics, StudyAnalyticsConfig config)
+    {
+        // 检查提醒开关是否启用
+        if (!config.AlertSoundEnabled)
+        {
+            _lastLevelKind = metrics.LevelKind;
+            return;
+        }
+
+        // 只在级别变化时发送通知
+        if (metrics.LevelKind == _lastLevelKind)
+        {
+            return;
+        }
+
+        // 检查冷却时间
+        if (DateTime.Now - _lastAlertTime < _alertCooldown)
+        {
+            _lastLevelKind = metrics.LevelKind;
+            return;
+        }
+
+        // 只在严重级别时发送通知
+        if (metrics.LevelKind != DensityLevelKind.Severe)
+        {
+            _lastLevelKind = metrics.LevelKind;
+            return;
+        }
+
+        _lastAlertTime = DateTime.Now;
+        _lastLevelKind = metrics.LevelKind;
+
+        // 发送通知
+        try
+        {
+            var densityStr = metrics.DensityPerMin.ToString("F1");
+            var thresholdStr = metrics.ThresholdPerMin.ToString("F1");
+
+            // 判断是否需要显示在正中央（过于吵闹）
+            var isSevere = metrics.DensityPerMin > metrics.ThresholdPerMin * 1.5;
+
+            if (isSevere)
+            {
+                // 严重干扰：显示在正中央
+                var title = L("study.alert.severe_interrupt_title", "严重噪音干扰");
+                var message = string.Format(
+                    CultureInfo.CurrentCulture,
+                    L("study.alert.severe_interrupt_message", "环境噪音过于嘈杂，严重影响学习效率\n当前打断密度: {0}次/分钟\n建议：寻找更安静的学习环境"),
+                    densityStr);
+
+                App.CurrentNotificationService?.ShowWarning(title, message, NotificationPosition.Center);
+            }
+            else
+            {
+                // 一般提醒：显示在右上角
+                var title = L("study.alert.noise_interrupt_title", "噪音打断提醒");
+                var message = string.Format(
+                    CultureInfo.CurrentCulture,
+                    L("study.alert.noise_interrupt_message", "当前打断密度: {0}次/分钟\n已超过阈值: {1}次/分钟"),
+                    densityStr,
+                    thresholdStr);
+
+                App.CurrentNotificationService?.ShowWarning(title, message, NotificationPosition.TopRight);
+            }
+        }
+        catch
+        {
+            // 静默处理通知发送失败
+        }
+    }
 }

LanMountainDesktop/Views/NotificationDialogWindow.axaml

@@ -0,0 +1,74 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:fi="using:FluentIcons.Avalonia"
+        xmlns:vm="using:LanMountainDesktop.Views"
+        x:Class="LanMountainDesktop.Views.NotificationDialogWindow"
+        x:DataType="vm:NotificationDialogViewModel"
+        SystemDecorations="None"
+        Background="Transparent"
+        ShowInTaskbar="False"
+        Topmost="True"
+        CanResize="False"
+        SizeToContent="WidthAndHeight"
+        TransparencyLevelHint="Transparent"
+        ExtendClientAreaToDecorationsHint="True"
+        ExtendClientAreaChromeHints="NoChrome"
+        ExtendClientAreaTitleBarHeightHint="-1">
+
+    <Border x:Name="DialogCard"
+            Background="#E8EAED"
+            CornerRadius="28"
+            Padding="24,20"
+            MinWidth="320"
+            MaxWidth="480">
+        <StackPanel Spacing="16">
+            <!-- Header with icon and title -->
+            <Grid ColumnDefinitions="Auto,*" ColumnSpacing="12">
+                <Border Grid.Column="0"
+                        Width="40"
+                        Height="40"
+                        CornerRadius="20"
+                        Background="{Binding SeverityBackground}"
+                        VerticalAlignment="Center">
+                    <fi:SymbolIcon Symbol="{Binding SeverityIcon}"
+                                   FontSize="20"
+                                   Foreground="White"
+                                   HorizontalAlignment="Center"
+                                   VerticalAlignment="Center" />
+                </Border>
+                <TextBlock Grid.Column="1"
+                          Text="{Binding Title}"
+                          FontSize="18"
+                          FontWeight="SemiBold"
+                          TextWrapping="Wrap"
+                          VerticalAlignment="Center"
+                          Foreground="{DynamicResource SystemControlForegroundBaseHighBrush}" />
+            </Grid>
+
+            <!-- Message content -->
+            <TextBlock Text="{Binding Message}"
+                      FontSize="14"
+                      TextWrapping="Wrap"
+                      Foreground="{DynamicResource SystemControlForegroundBaseMediumBrush}"
+                      IsVisible="{Binding Message, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />
+
+            <!-- Action buttons -->
+            <StackPanel Orientation="Horizontal"
+                       Spacing="8"
+                       HorizontalAlignment="Right"
+                       IsVisible="{Binding HasButtons}">
+                <Button Content="{Binding SecondaryButtonText}"
+                       Command="{Binding SecondaryCommand}"
+                       CornerRadius="20"
+                       Padding="20,10"
+                       IsVisible="{Binding SecondaryButtonText, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />
+                <Button Content="{Binding PrimaryButtonText}"
+                       Command="{Binding PrimaryCommand}"
+                       Classes="accent"
+                       CornerRadius="20"
+                       Padding="20,10"
+                       IsVisible="{Binding PrimaryButtonText, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />
+            </StackPanel>
+        </StackPanel>
+    </Border>
+</Window>

LanMountainDesktop/Views/NotificationDialogWindow.axaml.cs

@@ -0,0 +1,181 @@
+using System;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Animation;
+using Avalonia.Animation.Easings;
+using Avalonia.Controls;
+using Avalonia.Media;
+using Avalonia.Styling;
+using Avalonia.Threading;
+using CommunityToolkit.Mvvm.ComponentModel;
+using FluentIcons.Avalonia;
+using FluentIcons.Avalonia.Fluent;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views;
+
+public partial class NotificationDialogWindow : Window
+{
+    private NotificationDialogViewModel? _viewModel;
+    private DispatcherTimer? _autoCloseTimer;
+    private bool _isClosing;
+
+    public TaskCompletionSource<bool>? CompletionSource { get; private set; }
+
+    public NotificationDialogWindow()
+    {
+        InitializeComponent();
+    }
+
+    public void Initialize(NotificationContent content, IAppearanceThemeService? themeService = null)
+    {
+        _viewModel = new NotificationDialogViewModel(content, this);
+        DataContext = _viewModel;
+
+        CompletionSource = new TaskCompletionSource<bool>();
+
+        bool isNightMode = false;
+        if (themeService is not null)
+        {
+            var snapshot = themeService.GetCurrent();
+            isNightMode = snapshot.IsNightMode;
+            RequestedThemeVariant = isNightMode ? ThemeVariant.Dark : ThemeVariant.Light;
+        }
+
+        if (DialogCard is not null)
+        {
+            DialogCard.Background = isNightMode
+                ? new SolidColorBrush(Color.Parse("#FF2D2D2D"))
+                : new SolidColorBrush(Color.Parse("#FFF8F9FA"));
+        }
+
+        if (!HasButtons(content) && content.Duration.HasValue)
+        {
+            _autoCloseTimer = new DispatcherTimer
+            {
+                Interval = content.Duration.Value
+            };
+            _autoCloseTimer.Tick += OnAutoCloseTimerTick;
+            _autoCloseTimer.Start();
+        }
+    }
+
+    private static bool HasButtons(NotificationContent content)
+    {
+        return !string.IsNullOrEmpty(content.PrimaryButtonText) ||
+               !string.IsNullOrEmpty(content.SecondaryButtonText);
+    }
+
+    private void OnAutoCloseTimerTick(object? sender, EventArgs e)
+    {
+        _autoCloseTimer?.Stop();
+        _ = CloseWithResultAsync(false);
+    }
+
+    public void OnPrimaryButtonClick()
+    {
+        _ = CloseWithResultAsync(true);
+    }
+
+    public void OnSecondaryButtonClick()
+    {
+        _ = CloseWithResultAsync(false);
+    }
+
+    private async Task CloseWithResultAsync(bool result)
+    {
+        if (_isClosing) return;
+        _isClosing = true;
+
+        _autoCloseTimer?.Stop();
+
+        if (DialogCard is not null)
+        {
+            DialogCard.RenderTransform = new ScaleTransform(1, 1);
+            DialogCard.Opacity = 1;
+
+            var animation = new Animation
+            {
+                Duration = TimeSpan.FromMilliseconds(200),
+                Easing = new QuadraticEaseOut(),
+                Children =
+                {
+                    new KeyFrame
+                    {
+                        Cue = new Cue(0d),
+                        Setters =
+                        {
+                            new Setter(OpacityProperty, 1d),
+                            new Setter(ScaleTransform.ScaleXProperty, 1d),
+                            new Setter(ScaleTransform.ScaleYProperty, 1d)
+                        }
+                    },
+                    new KeyFrame
+                    {
+                        Cue = new Cue(1d),
+                        Setters =
+                        {
+                            new Setter(OpacityProperty, 0d),
+                            new Setter(ScaleTransform.ScaleXProperty, 0.9d),
+                            new Setter(ScaleTransform.ScaleYProperty, 0.9d)
+                        }
+                    }
+                }
+            };
+
+            await animation.RunAsync(DialogCard);
+        }
+
+        CompletionSource?.TrySetResult(result);
+        Close();
+    }
+}
+
+public partial class NotificationDialogViewModel : ObservableObject
+{
+    private readonly NotificationDialogWindow _window;
+    private readonly NotificationContent _content;
+
+    [ObservableProperty] private string _title = string.Empty;
+    [ObservableProperty] private string? _message;
+    [ObservableProperty] private string? _primaryButtonText;
+    [ObservableProperty] private string? _secondaryButtonText;
+    [ObservableProperty] private bool _hasButtons;
+    [ObservableProperty] private string _severityIcon = "Info";
+    [ObservableProperty] private IBrush? _severityBackground;
+
+    public NotificationDialogViewModel(NotificationContent content, NotificationDialogWindow window)
+    {
+        _window = window;
+        _content = content;
+
+        Title = content.Title;
+        Message = content.Message;
+        PrimaryButtonText = content.PrimaryButtonText;
+        SecondaryButtonText = content.SecondaryButtonText;
+        HasButtons = !string.IsNullOrEmpty(content.PrimaryButtonText) || 
+                     !string.IsNullOrEmpty(content.SecondaryButtonText);
+
+        (SeverityIcon, SeverityBackground) = content.Severity switch
+        {
+            NotificationSeverity.Success => ("CheckmarkCircle", new SolidColorBrush(Color.Parse("#FF10B981"))),
+            NotificationSeverity.Warning => ("Warning", new SolidColorBrush(Color.Parse("#FFF59E0B"))),
+            NotificationSeverity.Error => ("ErrorCircle", new SolidColorBrush(Color.Parse("#FFEF4444"))),
+            _ => ("Info", new SolidColorBrush(Color.Parse("#FF3B82F6")))
+        };
+    }
+
+    [CommunityToolkit.Mvvm.Input.RelayCommand]
+    private void Primary()
+    {
+        _content.OnPrimaryButtonClick?.Invoke();
+        _window.OnPrimaryButtonClick();
+    }
+
+    [CommunityToolkit.Mvvm.Input.RelayCommand]
+    private void Secondary()
+    {
+        _content.OnSecondaryButtonClick?.Invoke();
+        _window.OnSecondaryButtonClick();
+    }
+}

LanMountainDesktop/Views/NotificationWindow.axaml

@@ -0,0 +1,96 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:LanMountainDesktop.ViewModels"
+        xmlns:fi="using:FluentIcons.Avalonia"
+        xmlns:controls="using:LanMountainDesktop.Controls"
+        x:Class="LanMountainDesktop.Views.NotificationWindow"
+        x:DataType="vm:NotificationViewModel"
+        SystemDecorations="None"
+        Background="Transparent"
+        ShowInTaskbar="False"
+        Topmost="True"
+        CanResize="False"
+        SizeToContent="WidthAndHeight"
+        TransparencyLevelHint="Transparent"
+        ExtendClientAreaToDecorationsHint="True"
+        ExtendClientAreaChromeHints="NoChrome"
+        ExtendClientAreaTitleBarHeightHint="-1">
+
+    <Window.Styles>
+        <Style Selector="Border.notification-card">
+            <Setter Property="Background" Value="{DynamicResource AdaptiveGlassPanelBackgroundBrush}" />
+            <Setter Property="BorderBrush" Value="{DynamicResource AdaptiveGlassPanelBorderBrush}" />
+            <Setter Property="BorderThickness" Value="1.2" />
+            <Setter Property="CornerRadius" Value="18" />
+            <Setter Property="Padding" Value="16,12" />
+        </Style>
+
+        <Style Selector="TextBlock.notification-title">
+            <Setter Property="FontSize" Value="14" />
+            <Setter Property="FontWeight" Value="SemiBold" />
+            <Setter Property="Foreground" Value="{DynamicResource AdaptiveTextPrimaryBrush}" />
+            <Setter Property="TextWrapping" Value="Wrap" />
+        </Style>
+
+        <Style Selector="TextBlock.notification-message">
+            <Setter Property="FontSize" Value="13" />
+            <Setter Property="FontWeight" Value="Regular" />
+            <Setter Property="Foreground" Value="{DynamicResource AdaptiveTextSecondaryBrush}" />
+            <Setter Property="TextWrapping" Value="Wrap" />
+            <Setter Property="MaxWidth" Value="260" />
+            <Setter Property="Margin" Value="0,2,0,0" />
+        </Style>
+
+        <Style Selector="Border.notification-severity-indicator">
+            <Setter Property="Width" Value="4" />
+            <Setter Property="CornerRadius" Value="2" />
+            <Setter Property="Margin" Value="0,4,12,4" />
+            <Setter Property="VerticalAlignment" Value="Stretch" />
+        </Style>
+    </Window.Styles>
+
+    <Border Margin="12"
+            Classes="notification-card"
+            x:Name="CardBorder"
+            PointerPressed="OnCardPointerPressed"
+            PointerEntered="OnCardPointerEntered"
+            PointerExited="OnCardPointerExited"
+            Cursor="Hand">
+        <Grid ColumnDefinitions="Auto,Auto,*" ColumnSpacing="0">
+            <Border Grid.Column="0"
+                    Classes="notification-severity-indicator"
+                    x:Name="SeverityIndicator"
+                    Background="#FF3B82F6" />
+
+            <Border Grid.Column="1"
+                    Width="40"
+                    Height="40"
+                    VerticalAlignment="Center"
+                    x:Name="IconContainer">
+                <Panel>
+                    <Image x:Name="IconImage"
+                           Stretch="Uniform"
+                           Source="{Binding Icon}"
+                           IsVisible="{Binding Icon, Converter={x:Static ObjectConverters.IsNotNull}}" />
+                    <fi:SymbolIcon x:Name="DefaultIcon"
+                                   FontSize="28"
+                                   Symbol="Info"
+                                   IsVisible="{Binding Icon, Converter={x:Static ObjectConverters.IsNull}}"
+                                   Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
+                </Panel>
+            </Border>
+
+            <StackPanel Grid.Column="2"
+                        Margin="12,0,0,0"
+                        VerticalAlignment="Center"
+                        Spacing="2">
+                <TextBlock Text="{Binding Title}"
+                           Classes="notification-title" />
+                <TextBlock Text="{Binding Message}"
+                           Classes="notification-message"
+                           IsVisible="{Binding Message, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />
+            </StackPanel>
+        </Grid>
+    </Border>
+</Window>
+

LanMountainDesktop/Views/NotificationWindow.axaml.cs

@@ -0,0 +1,240 @@
+using System;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Animation;
+using Avalonia.Animation.Easings;
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Media;
+using Avalonia.Styling;
+using Avalonia.Threading;
+using LanMountainDesktop.Services;
+using LanMountainDesktop.Theme;
+using LanMountainDesktop.ViewModels;
+
+namespace LanMountainDesktop.Views;
+
+public partial class NotificationWindow : Window
+{
+    private NotificationViewModel? _viewModel;
+    private DispatcherTimer? _autoCloseTimer;
+    private bool _isClosing;
+    private TimeSpan _remainingDuration;
+
+    public Guid NotificationId => _viewModel?.Id ?? Guid.Empty;
+    public NotificationPosition NotificationPositionValue => _viewModel?.Position ?? NotificationPosition.TopRight;
+
+    public NotificationWindow()
+    {
+        InitializeComponent();
+        _remainingDuration = TimeSpan.FromSeconds(4);
+    }
+
+    public void Initialize(NotificationViewModel viewModel, IAppearanceThemeService? themeService = null)
+    {
+        _viewModel = viewModel;
+        DataContext = viewModel;
+        
+        _remainingDuration = viewModel.Duration;
+        
+        ApplyTheme(themeService);
+        ApplySeverityColor();
+    }
+
+    private void ApplyTheme(IAppearanceThemeService? themeService)
+    {
+        if (themeService is null) return;
+
+        var snapshot = themeService.GetCurrent();
+        RequestedThemeVariant = snapshot.IsNightMode ? ThemeVariant.Dark : ThemeVariant.Light;
+
+        // Apply glass effect resources directly to window resources
+        // This ensures the notification card has proper background/border colors
+        var context = CreateThemeContext(snapshot);
+        GlassEffectService.ApplyGlassResources(Resources, context);
+
+        // IMPORTANT: Do NOT call ApplyWindowMaterial for notification windows!
+        // ApplyWindowMaterial sets Background to White when MaterialMode is "None",
+        // which causes the white border around the notification card.
+        // Notification windows must always have transparent background.
+        Background = Brushes.Transparent;
+        TransparencyLevelHint = [WindowTransparencyLevel.Transparent];
+    }
+
+    private ThemeColorContext CreateThemeContext(AppearanceThemeSnapshot snapshot)
+    {
+        // Create theme context for glass effect resources
+        // Note: IsLightBackground and IsLightNavBackground are derived from IsNightMode
+        // UseNeutralSurfaces is determined by ThemeColorMode
+        var useNeutralSurfaces = snapshot.ThemeColorMode == "Neutral";
+        var monetColors = snapshot.WallpaperSeedCandidates;
+
+        return new ThemeColorContext(
+            AccentColor: snapshot.AccentColor,
+            IsLightBackground: !snapshot.IsNightMode,
+            IsLightNavBackground: !snapshot.IsNightMode,
+            IsNightMode: snapshot.IsNightMode,
+            MonetPalette: snapshot.MonetPalette,
+            MonetColors: monetColors,
+            UseNeutralSurfaces: useNeutralSurfaces,
+            SystemMaterialMode: snapshot.SystemMaterialMode);
+    }
+
+    private void ApplySeverityColor()
+    {
+        if (_viewModel is null) return;
+        
+        if (this.TryFindResource(_viewModel.SeverityColorResource, out var resource) && resource is IBrush brush)
+        {
+            SeverityIndicator.Background = brush;
+        }
+        else
+        {
+            // Fallback for custom theme compatibility
+            var severityColor = _viewModel.Severity switch
+            {
+                NotificationSeverity.Success => Color.Parse("#FF10B981"),
+                NotificationSeverity.Warning => Color.Parse("#FFF59E0B"),
+                NotificationSeverity.Error => Color.Parse("#FFEF4444"),
+                _ => Color.Parse("#FF3B82F6")
+            };
+            SeverityIndicator.Background = new SolidColorBrush(severityColor);
+        }
+    }
+
+    public void StartAutoCloseTimer()
+    {
+        _autoCloseTimer = new DispatcherTimer
+        {
+            Interval = _remainingDuration
+        };
+        _autoCloseTimer.Tick += OnAutoCloseTimerTick;
+        _autoCloseTimer.Start();
+    }
+
+    private void OnAutoCloseTimerTick(object? sender, EventArgs e)
+    {
+        _autoCloseTimer?.Stop();
+        Dispatcher.UIThread.Post(() => _ = CloseWithAnimationAsync());
+    }
+
+    private void OnCardPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (_viewModel?.OnClick is not null)
+        {
+            _viewModel.OnClick.Invoke();
+        }
+        _ = CloseWithAnimationAsync();
+    }
+
+    private void OnCardPointerEntered(object? sender, PointerEventArgs e)
+    {
+        _autoCloseTimer?.Stop();
+        CardBorder.Opacity = 0.95;
+    }
+
+    private void OnCardPointerExited(object? sender, PointerEventArgs e)
+    {
+        CardBorder.Opacity = 1;
+        StartAutoCloseTimer();
+    }
+
+    public async Task CloseWithAnimationAsync()
+    {
+        if (_isClosing) return;
+        _isClosing = true;
+
+        _autoCloseTimer?.Stop();
+        
+        if (_viewModel is not null)
+        {
+            _viewModel.IsClosing = true;
+        }
+
+        CardBorder.RenderTransform = new ScaleTransform(1, 1);
+        CardBorder.Opacity = 1;
+
+        var animation = new Animation
+        {
+            Duration = TimeSpan.FromMilliseconds(200),
+            Easing = new QuadraticEaseOut(),
+            Children =
+            {
+                new KeyFrame
+                {
+                    Cue = new Cue(0d),
+                    Setters =
+                    {
+                        new Setter(OpacityProperty, 1d),
+                        new Setter(ScaleTransform.ScaleXProperty, 1d),
+                        new Setter(ScaleTransform.ScaleYProperty, 1d)
+                    }
+                },
+                new KeyFrame
+                {
+                    Cue = new Cue(1d),
+                    Setters =
+                    {
+                        new Setter(OpacityProperty, 0d),
+                        new Setter(ScaleTransform.ScaleXProperty, 0.9d),
+                        new Setter(ScaleTransform.ScaleYProperty, 0.9d)
+                    }
+                }
+            }
+        };
+
+        await animation.RunAsync(CardBorder);
+
+        Close();
+    }
+
+    public async Task ShowWithAnimationAsync()
+    {
+        // Show window first (material should already be applied in Initialize)
+        Show();
+
+        // Ensure render transform is set before animation
+        CardBorder.RenderTransform = new ScaleTransform(0.85, 0.85);
+        CardBorder.Opacity = 0;
+
+        var animation = new Animation
+        {
+            Duration = TimeSpan.FromMilliseconds(250),
+            Easing = new QuadraticEaseOut(),
+            FillMode = FillMode.Forward,
+            Children =
+            {
+                new KeyFrame
+                {
+                    Cue = new Cue(0d),
+                    Setters =
+                    {
+                        new Setter(OpacityProperty, 0d),
+                        new Setter(ScaleTransform.ScaleXProperty, 0.85d),
+                        new Setter(ScaleTransform.ScaleYProperty, 0.85d)
+                    }
+                },
+                new KeyFrame
+                {
+                    Cue = new Cue(1d),
+                    Setters =
+                    {
+                        new Setter(OpacityProperty, 1d),
+                        new Setter(ScaleTransform.ScaleXProperty, 1d),
+                        new Setter(ScaleTransform.ScaleYProperty, 1d)
+                    }
+                }
+            }
+        };
+
+        await animation.RunAsync(CardBorder);
+        
+        StartAutoCloseTimer();
+    }
+
+    protected override void OnClosing(WindowClosingEventArgs e)
+    {
+        _autoCloseTimer?.Stop();
+        base.OnClosing(e);
+    }
+}

LanMountainDesktop/Views/SettingsPages/NotificationSettingsPage.axaml

@@ -0,0 +1,112 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:LanMountainDesktop.ViewModels"
+             xmlns:controls="using:LanMountainDesktop.Controls"
+             xmlns:ui="using:FluentAvalonia.UI.Controls"
+             xmlns:fi="using:FluentIcons.Avalonia.Fluent"
+             x:Class="LanMountainDesktop.Views.SettingsPages.NotificationSettingsPage"
+             x:DataType="vm:NotificationSettingsPageViewModel">
+    <ScrollViewer VerticalScrollBarVisibility="Auto">
+        <StackPanel Classes="settings-page-container settings-page-animated">
+
+            <controls:IconText Icon="Alert"
+                               Text="{Binding NotificationHeader}"
+                               Margin="0,0,0,4" />
+
+            <ui:SettingsExpander Header="{Binding EnableNotificationHeader}"
+                                 Description="{Binding EnableNotificationDescription}">
+                <ui:SettingsExpander.IconSource>
+                    <fi:SymbolIconSource Symbol="Alert" />
+                </ui:SettingsExpander.IconSource>
+                <ui:SettingsExpander.Footer>
+                    <ToggleSwitch IsChecked="{Binding IsNotificationEnabled}" />
+                </ui:SettingsExpander.Footer>
+            </ui:SettingsExpander>
+
+            <Separator Classes="settings-separator" />
+
+            <controls:IconText Icon="Alert"
+                               Text="{Binding BehaviorHeader}"
+                               Margin="0,0,0,4" />
+
+            <ui:SettingsExpander Header="{Binding HoverPauseHeader}"
+                                 Description="{Binding HoverPauseDescription}">
+                <ui:SettingsExpander.IconSource>
+                    <fi:SymbolIconSource Symbol="CursorHover" />
+                </ui:SettingsExpander.IconSource>
+                <ui:SettingsExpander.Footer>
+                    <ToggleSwitch IsChecked="{Binding IsHoverPauseEnabled}" />
+                </ui:SettingsExpander.Footer>
+            </ui:SettingsExpander>
+
+            <ui:SettingsExpander Header="{Binding ClickCloseHeader}"
+                                 Description="{Binding ClickCloseDescription}">
+                <ui:SettingsExpander.IconSource>
+                    <fi:SymbolIconSource Symbol="CursorClick" />
+                </ui:SettingsExpander.IconSource>
+                <ui:SettingsExpander.Footer>
+                    <ToggleSwitch IsChecked="{Binding IsClickCloseEnabled}" />
+                </ui:SettingsExpander.Footer>
+            </ui:SettingsExpander>
+
+            <ui:SettingsExpander Header="{Binding MaxNotificationsHeader}"
+                                 Description="{Binding MaxNotificationsDescription}">
+                <ui:SettingsExpander.IconSource>
+                    <fi:SymbolIconSource Symbol="NumberSymbol" />
+                </ui:SettingsExpander.IconSource>
+                <ui:SettingsExpander.Footer>
+                    <ui:NumberBox Value="{Binding MaxNotificationsPerPosition}"
+                                  Minimum="1"
+                                  Maximum="10"
+                                  Width="100"
+                                  SpinButtonPlacementMode="Inline" />
+                </ui:SettingsExpander.Footer>
+            </ui:SettingsExpander>
+
+            <Separator Classes="settings-separator" />
+
+            <controls:IconText Icon="Beaker"
+                               Text="{Binding TestHeader}"
+                               Margin="0,0,0,4" />
+
+            <ui:SettingsExpander Header="{Binding TestNotificationHeader}"
+                                 Description="{Binding TestNotificationDescription}">
+                <ui:SettingsExpander.IconSource>
+                    <fi:SymbolIconSource Symbol="Beaker" />
+                </ui:SettingsExpander.IconSource>
+                <ui:SettingsExpander.Footer>
+                    <StackPanel Orientation="Horizontal" Spacing="8">
+                        <ComboBox Width="120"
+                                  ItemsSource="{Binding TestPositions}"
+                                  SelectedItem="{Binding SelectedTestPosition}">
+                            <ComboBox.ItemTemplate>
+                                <DataTemplate x:DataType="vm:SelectionOption">
+                                    <TextBlock Text="{Binding Label}" />
+                                </DataTemplate>
+                            </ComboBox.ItemTemplate>
+                        </ComboBox>
+                        <ComboBox Width="100"
+                                  ItemsSource="{Binding TestSeverities}"
+                                  SelectedItem="{Binding SelectedTestSeverity}">
+                            <ComboBox.ItemTemplate>
+                                <DataTemplate x:DataType="vm:SelectionOption">
+                                    <TextBlock Text="{Binding Label}" />
+                                </DataTemplate>
+                            </ComboBox.ItemTemplate>
+                        </ComboBox>
+                        <ui:NumberBox Width="100"
+                                      Minimum="1"
+                                      Maximum="30"
+                                      SpinButtonPlacementMode="Inline"
+                                      Value="{Binding TestDurationSeconds}" />
+                        <Button Command="{Binding SendTestCommand}"
+                                Classes="accent">
+                            <fi:SymbolIcon Symbol="Send" FontSize="16" />
+                        </Button>
+                    </StackPanel>
+                </ui:SettingsExpander.Footer>
+            </ui:SettingsExpander>
+
+        </StackPanel>
+    </ScrollViewer>
+</UserControl>

LanMountainDesktop/Views/SettingsPages/NotificationSettingsPage.axaml.cs

@@ -0,0 +1,30 @@
+using LanMountainDesktop.PluginSdk;
+using LanMountainDesktop.Services.Settings;
+using LanMountainDesktop.ViewModels;
+
+namespace LanMountainDesktop.Views.SettingsPages;
+
+[SettingsPageInfo(
+    "notifications",
+    "通知",
+    SettingsPageCategory.Components,
+    IconKey = "Bell",
+    SortOrder = 5,
+    TitleLocalizationKey = "settings.notifications.title",
+    DescriptionLocalizationKey = "settings.notifications.description")]
+public partial class NotificationSettingsPage : SettingsPageBase
+{
+    public NotificationSettingsPage()
+        : this(new NotificationSettingsPageViewModel(HostSettingsFacadeProvider.GetOrCreate()))
+    {
+    }
+
+    public NotificationSettingsPage(NotificationSettingsPageViewModel viewModel)
+    {
+        ViewModel = viewModel;
+        DataContext = ViewModel;
+        InitializeComponent();
+    }
+
+    public NotificationSettingsPageViewModel ViewModel { get; }
+}

LanMountainDesktop/Views/SettingsWindow.axaml.cs

@@ -734,6 +734,8 @@ public partial class SettingsWindow : Window, ISettingsPageHostContext
             "Info" => Symbol.Info,
             "ArrowSync" => Symbol.ArrowSync,
             "Hourglass" => Symbol.Hourglass,
+            "Alert" => Symbol.Alert,  // 铃铛图标
+            "Bell" => Symbol.Alert,   // Bell也映射到Alert图标
             _ => Symbol.Settings
         };
     }

docs/component-corner-radius-unification-plan.txt

@@ -0,0 +1,304 @@
+LanMountainDesktop 组件圆角统一方案
+
+一、我对项目的理解
+- 这是一个基于 .NET 10 + Avalonia UI 的跨平台桌面宿主项目。
+- 核心形态是“组件化桌面信息看板”：组件可放置到桌面，可编辑、可缩放，既支持自由缩放，也支持等比例缩放。
+- 当前圆角体系本身并不是空白：项目已经有统一 token 和全局圆角倍率。
+  - 圆角 token 生成：LanMountainDesktop.Appearance/AppearanceCornerRadiusTokenFactory.cs
+  - 动态注入资源：LanMountainDesktop/Services/AppearanceThemeService.cs
+  - 基础 token 资源：LanMountainDesktop/Styles/GlassModule.axaml
+  - 宿主组件圆角助手：LanMountainDesktop/Views/Components/ComponentChromeCornerRadiusHelper.cs
+  - 插件圆角上下文：LanMountainDesktop.PluginSdk/PluginAppearanceContext.cs
+
+二、为什么现在“设置里同样是 1.0，但每个组件看起来不一样”
+根因不是一个，而是几层逻辑叠加造成的。
+
+1. 内置组件和插件组件默认算法不同
+- 内置组件宿主默认走 Component token：18 * GlobalCornerRadiusScale。
+  - 入口：LanMountainDesktop/Views/Components/DesktopComponentRuntimeRegistry.cs
+  - 默认 resolver：ComponentChromeCornerRadiusHelper.ResolveMainRectangleRadiusValue(...)
+- 插件组件默认走基于 cellSize 的动态算法：
+  - LanMountainDesktop.PluginSdk/PluginDesktopComponentRegistration.cs
+  - 当前默认逻辑约等于：Math.Clamp(cellSize * 0.22, 8, 18) * scale
+- 这意味着：同样设置为 1.0，内置组件趋向固定圆角，插件组件趋向“随格子大小变化”。
+- 结果：用户感知到“同样设置值，但不同组件圆角不一样”。
+
+2. 可见外壳并没有真正统一由宿主接管
+- MainWindow.ComponentSystem.cs 里宿主会给 host/contentHost 设置圆角。
+- 但大量组件内部还有自己的 RootBorder / CardBorder / 内层卡片，并且也各自设置圆角。
+- 一旦“宿主外壳 + 组件根层 + 组件内部卡片”同时存在，用户最终看到的是最内层那个可见边界，而不一定是宿主设的边界。
+- 典型现象：
+  - 某些组件外层 Border 是透明的，真正可见的是里面第二层 CardBorder。
+  - 某些组件直接在代码里写死 new CornerRadius(...)。
+
+3. 组件内部仍有硬编码圆角
+- 例如：
+  - DailyNewsView.axaml.cs 有 new CornerRadius(4)
+  - CnrDailyNewsWidget.axaml 有 CornerRadius="21"
+  - DesktopComponentFailureView.cs 有 12 / 18 / 999 等固定值
+- 这些值本身不一定错，但如果它们承担的是“组件主外轮廓”，就会破坏统一性。
+
+4. 等比例缩放组件大量使用 Viewbox，视觉边界和内容边界不是一回事
+- 例如 LunarCalendarWidget.axaml、DateWidget.axaml、MonthCalendarWidget.axaml、AnalogClockWidget.axaml 等都使用 Viewbox Stretch="Uniform"。
+- 这类组件通常是：外层 Border 固定圆角，内部设计稿按 300x300 或类似基准缩放。
+- 如果另一些组件是自由布局、自由撑开、非 Viewbox 驱动，那么即便外层半径数值相同，视觉上也会显得不一样。
+- 原因是：内容密度、留白、边缘贴合程度不同，会显著影响人眼对圆角大小的判断。
+
+5. 宿主的 visualInset 也在影响观感
+- MainWindow.ComponentSystem.cs 里的 GetDesktopComponentVisualInset(...) 会根据组件宽高格子数改变内缩量。
+- 宿主目前是“命中范围/编辑范围一套，实际可见内容再缩进去一层”。
+- 当不同尺寸组件有不同 inset，而组件自己又有独立圆角时，视觉上就更容易出现“同 18 看起来不像同 18”的问题。
+
+三、统一方案的核心原则
+原则只有一句：
+“组件主外轮廓的圆角，只能有一个最终权威来源。”
+
+建议把圆角分成三层：
+1. 组件外壳圆角（主轮廓）
+2. 组件内部区域圆角（二级卡片）
+3. 微元素圆角（按钮、标签、图片卡片、chip）
+
+其中，只有第 1 层决定“这个组件作为桌面卡片整体看起来有多圆”。
+
+四、推荐的统一规则
+
+A. 统一“组件主外壳圆角”
+推荐规则：
+- 所有桌面组件，不区分内置/插件，不区分自由缩放/等比缩放，默认主外壳统一使用：
+  OuterRadius = CornerRadiusTokens.Component
+- 也就是当前 token 体系里的 Component 档。
+- 在 1.0 设置下，就是 18。
+- 这个值只受全局圆角倍率影响，不再受 cellSize 直接影响。
+
+推荐最终规则：
+- 标准情况：
+  OuterRadius = tokens.Component
+- 极小组件兜底（仅防止尺寸过小导致圆角挤爆）:
+  OuterRadius = Min(tokens.Component, Min(actualWidth, actualHeight) * 0.18)
+- 但这个“极小兜底”只在组件物理尺寸不够时触发；正常组件应保持完全一致。
+
+这条规则的意义：
+- 用户调到 1.0，所有组件都会首先落在同一个视觉档位。
+- 只有非常小的组件才会被动缩小圆角，避免失真。
+- 这样既统一，又不会在边缘尺寸下破版。
+
+B. 插件默认算法必须改成和宿主一致
+当前插件默认算法是按 cellSize 算的，这是造成不一致的最直接原因之一。
+
+建议修改：
+- 把 PluginDesktopComponentRegistration.cs 里的默认逻辑，从：
+  appearance.ResolveScaledCornerRadius(Math.Clamp(cellSize * 0.22, 8, 18), 8, 18)
+- 改为：
+  appearance.ResolveCornerRadius(PluginCornerRadiusPreset.Component)
+
+含义：
+- 插件如果没有特别声明，就跟内置组件一样，默认使用 Component 档主外壳圆角。
+- 只有插件作者明确声明特殊需求时，才允许自定义 resolver。
+
+C. 宿主要成为“唯一外壳提供者”
+这是最重要的一条。
+
+建议新增统一壳层，例如：
+- DesktopComponentShell
+或
+- DesktopComponentChrome
+
+职责：
+- 负责组件真正可见的最外层背景、边框、裁剪、主圆角
+- 负责统一 padding / glass / border / shadow
+- 负责选中态、拖拽态、编辑态的视觉装饰
+- 组件内容只负责“内容”，不再负责“卡片主轮廓”
+
+理想结构：
+- Host Border / Shell = 真正的可见外轮廓
+- Component Root = 尽量透明，不再自己承担主卡片圆角
+- Inner Sections = 使用 Sm / Xs / Micro 等 token
+
+也就是说：
+- 主外轮廓只在壳层定义一次
+- 组件内部不再重复定义一个同等级 RootBorder 当作主卡片
+
+D. 统一内部层级，不要所有层都用 Component
+建议把当前 token 真正分层使用：
+- Component：桌面组件主外壳
+- Sm：内部小卡片、图片区、内容区块
+- Xs：按钮、输入框、chip、小容器
+- Micro：极小 badge / 标签
+- Island / Xl / Lg：只给岛状栏位、大面板、设置窗口，不用于普通桌面组件
+
+落地约束：
+- 桌面组件主根层禁止再写 DesignCornerRadiusLg / Xl / Island
+- 组件主根层禁止使用硬编码 21 / 16 / 24 / 30 之类值
+- 子卡片允许用 Sm / Xs，但不能与主壳争夺“主轮廓”角色
+
+E. 等比例缩放与自由缩放分别处理，但外圆角规则相同
+1）等比例缩放组件（Viewbox）
+- 外壳圆角固定由宿主提供，不参与 Viewbox 缩放。
+- Viewbox 只缩放内部设计稿。
+- 外壳与内部设计稿之间保留统一“安全留白”。
+
+建议：
+- SafeInset = Max(8, OuterRadius * 0.45)
+- 对所有 Viewbox 类组件，外层容器 padding 使用统一公式，而不是每个组件自己猜。
+
+2）自由缩放组件
+- 外壳圆角仍固定由宿主提供。
+- 自由缩放只影响内容布局、字号、图表密度、行数和间距，不影响主外壳半径。
+- 内容内部若要变化，优先变化：padding、gap、字号、图标尺寸，而不是外圆角。
+
+这样做的结果：
+- 缩放方式不同，但最外层的“卡片家族感”一致。
+- 用户调的是“整体风格圆角”，不是“每个组件自己的数学公式”。
+
+F. 把 visualInset 从“影响圆角观感”变成“只影响编辑/命中逻辑”
+当前 GetDesktopComponentVisualInset(...) 会让不同大小组件看起来边界不同。
+
+建议二选一：
+1. 更推荐：
+- 让宿主 shell 成为真实可见边界
+- visualInset 只服务拖拽/选中/吸附逻辑，不再改变真实可见主卡片的边界层次
+
+2. 如果暂时不重构：
+- 把 visualInset 改成固定档位，而不是随 widthCells / heightCells 持续变化
+- 例如统一为 6 或 8 的 token 化 inset
+
+目标：
+- 组件整体轮廓不要再因为跨度不同而“看起来圆角不同”
+
+五、具体改造建议（按代码位置）
+
+1. 插件默认圆角统一
+文件：LanMountainDesktop.PluginSdk/PluginDesktopComponentRegistration.cs
+建议：
+- 默认从“基于 cellSize 动态计算”改成“直接取 Component preset”。
+
+2. 宿主外壳统一
+文件：LanMountainDesktop/Views/MainWindow.ComponentSystem.cs
+重点方法：
+- CreateDesktopComponentHost(...)
+- GetComponentCornerRadius(...)
+- GetDesktopComponentVisualInset(...)
+
+建议：
+- 让 contentHost 或新建 shell 成为真实可见主边界
+- 背景、边框、裁剪、圆角统一放在 shell
+- host 仅保留命中、拖拽、选中装饰
+- visualInset 不再影响真实主卡片外观，最多影响编辑态附加层
+
+3. 统一运行时默认 resolver
+文件：LanMountainDesktop/Views/Components/DesktopComponentRuntimeRegistry.cs
+建议：
+- 保留 DefaultCornerRadiusResolver 走 Component token
+- 新增统一 chrome metrics 输出，供组件内部使用：
+  - OuterRadius
+  - InnerRadiusSm
+  - InnerRadiusXs
+  - SafeInset
+  - GlobalCornerRadiusScale
+
+4. 扩展 chrome 上下文
+文件：
+- LanMountainDesktop.Host.Abstractions/ComponentChromeContext.cs
+- LanMountainDesktop/Services/IComponentLibraryService.cs
+- LanMountainDesktop.PluginSdk/PluginAppearanceSnapshot.cs（如需要）
+
+建议新增字段：
+- ResolvedOuterCornerRadius
+- SafeInset
+- ChromePadding
+- VisualDensity 或 SizeClass（可选）
+
+目的：
+- 组件不要自己猜“我应该用多少主圆角”
+- 它只消费宿主已算好的结果
+
+5. 清理组件内部主轮廓重复定义
+重点检查目录：
+- LanMountainDesktop/Views/Components/
+
+优先整改对象：
+- CnrDailyNewsWidget.axaml（RootBorder + CardBorder 双层主轮廓）
+- BrowserWidget.axaml.cs（内部多层主卡片都取主圆角）
+- DailyNewsView.axaml / .cs（有硬编码子元素圆角）
+- DesktopComponentFailureView.cs（硬编码 12 / 18 / 999）
+- 使用 Viewbox 的日期、月历、农历、计时器、录音等组件
+
+整改原则：
+- 组件根层如果已经处于宿主 shell 内，应尽量透明化
+- 只保留内部结构性圆角，不再重复承担主卡片角色
+
+六、我建议采用的“统一视觉规范”
+
+1. 桌面组件主外壳
+- 统一：Component = 18 * scale
+- 默认 1.0 时全部按 18 展示
+- 仅极小尺寸时做 min(actualShortSide * 0.18) 兜底
+
+2. 内部板块
+- 统一：Sm = 14 * scale
+- 用于图片区、内嵌卡片、列表块、概览块
+
+3. 交互控件
+- 统一：Xs = 12 * scale
+- 用于普通按钮、输入框、小标签
+
+4. 胶囊按钮 / 圆按钮
+- 不走主卡片规则
+- 仍允许 half-height（例如 32 高就 16 半径）
+- 这是合法特例，因为它们不是“桌面组件主外轮廓”
+
+5. 大面板 / 岛 / 设置窗口
+- 保持 Lg / Xl / Island
+- 不要向桌面普通组件借用这些档位
+
+七、建议的落地步骤
+
+第一阶段：统一规则，不大改组件
+- 修改插件默认圆角算法，使插件先与内置组件对齐
+- 明确“主外壳 = Component token”这个规范
+- 先把所有失败态、默认态、插件兜底视图改成统一档位
+- 清理明显硬编码的主轮廓圆角
+
+第二阶段：建立统一 shell
+- 抽出 DesktopComponentShell / DesktopComponentChrome
+- 宿主统一负责外壳、背景、裁剪、边框、选中态
+- 组件内部改成内容优先，外轮廓透明化
+
+第三阶段：分批迁移内置组件
+推荐顺序：
+- 新闻资讯类
+- 日期/日历/时钟类
+- 天气类
+- 浏览器/复杂卡片类
+- 失败态/占位态/插件样例
+
+第四阶段：插件规范升级
+- 在 SDK 文档里新增说明：
+  - 插件主外壳不要自行写死圆角
+  - 默认使用宿主 Component preset
+  - 若必须特殊化，说明理由并走显式 CornerRadiusResolver
+
+八、验收标准
+
+改完之后，至少要满足这 5 条：
+1. 设置里圆角倍率调成 1.0 时，所有组件主外轮廓处于同一视觉档位。
+2. 内置组件与插件组件默认情况下看起来是一套语言。
+3. 等比例缩放与自由缩放组件虽然内容布局不同，但卡片外壳风格一致。
+4. 组件内部还可以有小圆角层级，但不会再和主外壳打架。
+5. 用户只需要理解“全局圆角倍率”，不需要理解不同组件背后的不同公式。
+
+九、我对你这个项目最推荐的最终结论
+最推荐的方案不是“继续微调每个组件自己的圆角公式”，而是：
+
+- 用宿主统一接管组件主外壳
+- 插件默认改成和宿主同一算法
+- 把圆角分成 主外壳 / 内部区块 / 微元素 三层
+- 让缩放影响内容，不再影响主外壳圆角
+
+一句话总结：
+“统一的不是每个 Border 的数字，而是组件最外层轮廓的控制权。”
+
+十、如果你要我继续往下做，最值得优先做的 3 件事
+1. 我先帮你列一份“当前所有组件圆角不统一点位清单（按文件逐个标出来）”
+2. 我再给你出一版“可直接改代码的重构方案”，包括新增 DesktopComponentShell 的接口设计
+3. 如果你愿意，我可以直接开始改第一批基础代码，把内置组件和插件默认圆角先统一起来