Baseline: WPF/Avalonia/Cli/Core + plans (BROWSER_FEATURES_PLAN v2, MOBILE_PLAN v1)

VideoDownloader.App/Themes/Dark.xaml

@@ -0,0 +1,35 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+
+    <!-- ===== 다크 팔레트 (단일 보라 액센트 - 의도적 통일) ===== -->
+    <SolidColorBrush x:Key="WindowBg"      Color="#0B0B10"/>
+    <LinearGradientBrush x:Key="WindowBgGradient" StartPoint="0,0" EndPoint="0,1">
+        <GradientStop Color="#11111B" Offset="0"/>
+        <GradientStop Color="#0B0B10" Offset="0.45"/>
+        <GradientStop Color="#09090D" Offset="1"/>
+    </LinearGradientBrush>
+    <SolidColorBrush x:Key="PanelBg"       Color="#14141C"/>
+    <SolidColorBrush x:Key="GlassBg"       Color="#1A1A24"/>
+    <SolidColorBrush x:Key="CardBg"        Color="#1C1C26"/>
+    <SolidColorBrush x:Key="CardBgHover"   Color="#242430"/>
+    <SolidColorBrush x:Key="BorderBrush"   Color="#2C2C3A"/>
+    <SolidColorBrush x:Key="BorderSubtle"  Color="#20202B"/>
+    <SolidColorBrush x:Key="TextPrimary"   Color="#F2F2F6"/>
+    <SolidColorBrush x:Key="TextSecondary" Color="#9B9BAC"/>
+    <SolidColorBrush x:Key="TextMuted"     Color="#62626E"/>
+    <SolidColorBrush x:Key="TrackBrush"    Color="#262631"/>
+    <SolidColorBrush x:Key="SuccessBrush"  Color="#34D399"/>
+    <SolidColorBrush x:Key="ErrorBrush"    Color="#F87171"/>
+    <SolidColorBrush x:Key="PendingBrush"  Color="#FBBF24"/>
+
+    <LinearGradientBrush x:Key="AccentGradient" StartPoint="0,0" EndPoint="1,1">
+        <GradientStop Color="#6366F1" Offset="0"/>
+        <GradientStop Color="#A855F7" Offset="1"/>
+    </LinearGradientBrush>
+    <SolidColorBrush x:Key="AccentBrush" Color="#7C6CFF"/>
+
+    <LinearGradientBrush x:Key="AccentFadeBrush" StartPoint="0,0" EndPoint="0,1">
+        <GradientStop Color="#556366F1" Offset="0"/>
+        <GradientStop Color="#006366F1" Offset="1"/>
+    </LinearGradientBrush>
+</ResourceDictionary>