v1.2.0: 重构为插件+独立Manager架构，横版UI，精确保留文本框边距的文档转换

Manager/App.xaml

@@ -0,0 +1,15 @@
+<Application x:Class="BetterSeewo.Manager.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+        <ResourceDictionary>
+            <Color x:Key="Bg">#0F0F1A</Color>
+            <Color x:Key="CardBg">#1A1A2E</Color>
+            <Color x:Key="Accent">#60B0FF</Color>
+            <Color x:Key="Fg">#D0D0E0</Color>
+            <Color x:Key="SubFg">#707090</Color>
+            <SolidColorBrush x:Key="BorderBrush" Color="#25FFFFFF"/>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>