style(theme): 客户端切换深色视觉风格

lib/pages/discover/discover_view.dart

@@ -35,8 +35,8 @@ import 'widgets/discover_header.dart';
 import 'widgets/discover_search_results.dart';
 import 'widgets/drama_grid.dart';
 
-const Color _filterIconColor = Color(0xFF7B61FF);
-const Color _newIconColor = Color(0xFF14B8A6);
+const Color _filterIconColor = AppColors.blueSoft;
+const Color _newIconColor = AppColors.blueSoft;
 const double _toolbarHeight = 36;
 const double _toolbarGap = 10;
 const double _toolbarRadius = 10;
@@ -165,9 +165,9 @@ class _DiscoverPageState extends State<DiscoverPage> {
       ),
     );
     return AnnotatedRegion<SystemUiOverlayStyle>(
-      value: SystemUiOverlayStyle.dark,
+      value: SystemUiOverlayStyle.light,
       child: Theme(
-        data: AppTheme.light(),
+        data: AppTheme.dark(),
         child: embedded
             ? content
             : Scaffold(backgroundColor: AppColors.ink, body: content),
@@ -228,13 +228,13 @@ class _DiscoverPageState extends State<DiscoverPage> {
           color: AppColors.ink,
           border: Border(
             bottom: BorderSide(
-              color: pinned ? AppColors.border : Colors.transparent,
+              color: pinned ? AppColors.border : AppColors.transparent,
             ),
           ),
           boxShadow: pinned
               ? const [
                   BoxShadow(
-                    color: Color(0x14000000),
+                    color: AppColors.shadowSubtle,
                     blurRadius: 8,
                     offset: Offset(0, 2),
                   ),
@@ -419,7 +419,7 @@ class _DiscoverPageState extends State<DiscoverPage> {
                 _categoryUnderlineHeight,
               ),
               painter: CategoryUnderlinePainter(
-                color: selected ? AppColors.blue : Colors.transparent,
+                color: selected ? AppColors.blue : AppColors.transparent,
               ),
             ),
           ],

lib/pages/discover/widgets/discover_search_field.dart

@@ -97,7 +97,7 @@ class _DiscoverSearchFieldState extends State<DiscoverSearchField> {
           color: AppColors.card,
           borderRadius: BorderRadius.circular(_searchRadius),
           border: Border.all(
-            color: _focused ? AppColors.blue : Colors.transparent,
+            color: _focused ? AppColors.blue : AppColors.transparent,
           ),
         ),
         child: Row(

lib/pages/discover/widgets/drama_grid.dart

@@ -23,8 +23,8 @@ const double _tagChipFontSize = 11;
 const double _heatFontSize = 9;
 const double _heatIconSize = 11;
 const int _maxTags = 3;
-const Color _heatBackground = Color(0x99000000);
-const Color _tagChipBackground = Color(0xFFF4F1EE);
+const Color _heatBackground = AppColors.overlayMedium;
+const Color _tagChipBackground = AppColors.raised;
 final RegExp _tagSplitter = RegExp(r'[,/、·]');
 
 /// 剧场/分类页共用的双列剧目网格。
@@ -231,11 +231,11 @@ class _DiscoverCoverImage extends StatelessWidget {
 
   Widget _placeholder() {
     return const ColoredBox(
-      color: AppColors.card,
+      color: AppColors.raised,
       child: Center(
         child: Icon(
           Icons.image_not_supported_outlined,
-          color: AppColors.muted,
+          color: AppColors.subtle,
           size: 32,
         ),
       ),

lib/pages/discover/widgets/feed_banner_carousel.dart

@@ -183,8 +183,8 @@ class _FeedBannerCarouselState extends State<FeedBannerCarousel> {
                 begin: Alignment.topCenter,
                 end: Alignment.bottomCenter,
                 colors: drama == null
-                    ? const [Color(0x00000000), Color(0x8A0B0C10)]
-                    : const [Color(0x00000000), Color(0xE6000000)],
+                    ? const [AppColors.transparent, AppColors.bannerScrimMid]
+                    : const [AppColors.transparent, AppColors.bannerScrimEnd],
               ),
             ),
           ),
@@ -232,7 +232,7 @@ class _FeedBannerCarouselState extends State<FeedBannerCarousel> {
       child: dramaId == null
           ? card
           : Material(
-              color: Colors.transparent,
+              color: AppColors.transparent,
               borderRadius: borderRadius,
               clipBehavior: Clip.antiAlias,
               child: InkWell(