feat(ads/seo/release): v1.2.0 with live Google Ads, isolated ad profile, ads.txt, and SEO/AEO/GEO optimization

src/Paca.App/Themes/Dark.xaml

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+<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) =====
+         UC-T14/T15/T18/A20: WCAG 대비 결함 수정 — TextMuted/BorderBrush/AccentBrush 밝게 조정. -->
+    <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="Surface2"      Color="#181822"/>
+    <SolidColorBrush x:Key="GlassBg"       Color="#1A1A24"/>
+    <SolidColorBrush x:Key="GlassBorder"   Color="#2A2A38"/>
+    <SolidColorBrush x:Key="CardBg"        Color="#1C1C26"/>
+    <SolidColorBrush x:Key="CardBgHover"   Color="#242430"/>
+    <SolidColorBrush x:Key="DimOverlayBrush" Color="#CC000000"/>
+    <SolidColorBrush x:Key="BorderBrush"   Color="#6C6C8A"/>
+    <SolidColorBrush x:Key="BorderSubtle"  Color="#20202B"/>
+    <SolidColorBrush x:Key="TextPrimary"   Color="#F2F2F6"/>
+    <SolidColorBrush x:Key="TextSecondary" Color="#CBD5E1"/>
+    <SolidColorBrush x:Key="TextMuted"     Color="#A1A1AA"/>
+    <SolidColorBrush x:Key="TextDisabled"  Color="#71717A"/>
+    <SolidColorBrush x:Key="TrackBrush"    Color="#262631"/>
+    <SolidColorBrush x:Key="SuccessBrush"  Color="#34D399"/>
+    <SolidColorBrush x:Key="ErrorBrush"    Color="#F87171"/>
+    <SolidColorBrush x:Key="PendingBrush"  Color="#FBBF24"/>
+    <SolidColorBrush x:Key="WarningBrush"  Color="#FB923C"/>
+    <SolidColorBrush x:Key="InfoBrush"     Color="#60A5FA"/>
+    <SolidColorBrush x:Key="SelectionBrush" Color="#4A3F9E"/>
+    <SolidColorBrush x:Key="FocusAdornerBrush" Color="#B4A7FF"/>
+    <SolidColorBrush x:Key="LinkBrush"     Color="#93B4FF"/>
+    <SolidColorBrush x:Key="VisitedLinkBrush" Color="#C4A9E8"/>
+    <SolidColorBrush x:Key="AccentTextBrush" Color="#A99DFF"/>
+
+    <!-- 마이크로 상태 글로우 브러시 (다운로드 중 은은한 네온 펄스 & 완료 성공 틴트) -->
+    <SolidColorBrush x:Key="StatusGlowActiveBrush" Color="#226366F1"/>
+    <SolidColorBrush x:Key="StatusGlowSuccessBrush" Color="#2234D399"/>
+    <SolidColorBrush x:Key="StatusGlowErrorBrush" Color="#22F87171"/>
+
+    <!-- 프리미엄 스크롤바 브러시 (다크 - 초슬림 미니멀) -->
+    <SolidColorBrush x:Key="ScrollBarTrackBrush"      Color="Transparent"/>
+    <SolidColorBrush x:Key="ScrollBarThumbBrush"      Color="#26FFFFFF"/>
+    <SolidColorBrush x:Key="ScrollBarThumbHoverBrush" Color="#66FFFFFF"/>
+    <SolidColorBrush x:Key="ScrollBarThumbDragBrush"  Color="#99FFFFFF"/>
+
+    <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="#8B7CFF"/>
+
+    <LinearGradientBrush x:Key="AccentFadeBrush" StartPoint="0,0" EndPoint="0,1">
+        <GradientStop Color="#556366F1" Offset="0"/>
+        <GradientStop Color="#006366F1" Offset="1"/>
+    </LinearGradientBrush>
+
+    <!-- UC-T09 강조색 프리셋 스와치 (설정창 색 선택기가 참조) -->
+    <SolidColorBrush x:Key="Accent.Blue"   Color="#60A5FA"/>
+    <SolidColorBrush x:Key="Accent.Green"  Color="#34D399"/>
+    <SolidColorBrush x:Key="Accent.Pink"   Color="#F472B6"/>
+    <SolidColorBrush x:Key="Accent.Orange" Color="#FB923C"/>
+</ResourceDictionary>