fix(flutter): 简介灰字统一并透明暂停按钮

lib/pages/player/widgets/player_center_toggle.dart

@@ -22,13 +22,9 @@ class PlayerCenterToggle extends StatelessWidget {
       label: playing ? 'Pause' : 'Play',
       child: GestureDetector(
         onTap: onTap,
-        child: Container(
+        child: SizedBox(
           width: 52,
           height: 52,
-          decoration: const BoxDecoration(
-            color: AppColors.blue,
-            shape: BoxShape.circle,
-          ),
           child: Icon(
             playing ? Icons.pause_rounded : Icons.play_arrow_rounded,
             color: AppColors.onPrimary,

lib/pages/player/widgets/player_overlay_parts.dart

@@ -241,16 +241,11 @@ class _EpisodeSynopsis extends StatefulWidget {
 class _EpisodeSynopsisState extends State<_EpisodeSynopsis> {
   bool _expanded = false;
 
-  static const TextStyle _labelStyle = TextStyle(
-    color: AppColors.onPrimary,
-    fontSize: 12,
-    fontWeight: FontWeight.w700,
-    shadows: _playerTextShadows,
-  );
-
-  static const TextStyle _synopsisStyle = TextStyle(
+  /// 「第 n 集」、分隔符与简介正文共用同一套灰字规格。
+  static const TextStyle _lineStyle = TextStyle(
     color: AppColors.playerMuted,
     fontSize: 12,
+    fontWeight: FontWeight.w500,
     height: 1.35,
     shadows: _playerTextShadows,
   );
@@ -270,17 +265,15 @@ class _EpisodeSynopsisState extends State<_EpisodeSynopsis> {
               key: const Key('player-episode-label'),
               maxLines: 1,
               overflow: TextOverflow.ellipsis,
-              style: _labelStyle,
+              style: _lineStyle,
             ),
-            const Padding(
-              padding: EdgeInsets.symmetric(horizontal: 6),
+            Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 6),
               child: Text(
                 '|',
                 maxLines: 1,
-                style: TextStyle(
-                  color: Colors.white54,
-                  fontSize: 12,
-                  shadows: _playerTextShadows,
+                style: _lineStyle.copyWith(
+                  color: AppColors.playerMuted.withValues(alpha: 0.6),
                 ),
               ),
             ),
@@ -290,7 +283,7 @@ class _EpisodeSynopsisState extends State<_EpisodeSynopsis> {
                 key: const Key('player-synopsis'),
                 maxLines: _expanded ? null : 1,
                 overflow: _expanded ? TextOverflow.clip : TextOverflow.ellipsis,
-                style: _synopsisStyle,
+                style: _lineStyle,
               ),
             ),
             if (!_expanded) _toggle(widget.l10n.expandSynopsis),

test/player/player_center_toggle_test.dart

@@ -33,16 +33,16 @@ void main() {
       Key('player-play-toggle'),
     ]) {
       expect(tester.getSize(find.byKey(key)), const Size(52, 52));
-      final container = tester.widget<Container>(
+      // 暂停按钮改为透明背景，容器已不再绘制任何底色或装饰。
+      expect(
         find.descendant(of: find.byKey(key), matching: find.byType(Container)),
+        findsNothing,
       );
-      final decoration = container.decoration! as BoxDecoration;
-      expect(decoration.color, AppColors.blue);
-      expect(decoration.shape, BoxShape.circle);
       final icon = tester.widget<Icon>(
         find.descendant(of: find.byKey(key), matching: find.byType(Icon)),
       );
       expect(icon.size, 26);
+      expect(icon.color, AppColors.onPrimary);
     }
   });
 }

test/player/player_fullscreen_test.dart

@@ -380,6 +380,30 @@ void main() {
     expect(tester.widget<Text>(synopsis).maxLines, 1);
   });
 
+  testWidgets('should_share_one_muted_style_across_label_and_synopsis', (
+    tester,
+  ) async {
+    await _pumpApp(tester);
+    await _openSeriesPlayer(tester);
+
+    TextStyle styleOf(Finder finder) =>
+        tester.widget<Text>(finder).style ?? const TextStyle();
+    final label = styleOf(find.byKey(const Key('player-episode-label')));
+    final synopsis = styleOf(find.byKey(const Key('player-synopsis')));
+    final separator = styleOf(
+      find.descendant(
+        of: find.byKey(const Key('player-episode-synopsis')),
+        matching: find.text('|'),
+      ),
+    );
+    for (final style in [label, synopsis, separator]) {
+      expect(style.fontSize, 12);
+      expect(style.fontWeight, FontWeight.w500);
+      expect(style.color?.withValues(alpha: 1), AppColors.playerMuted);
+    }
+    expect(separator.color, isNot(Colors.white));
+  });
+
   testWidgets('should_fit_long_title_and_synopsis_at_320_width', (
     tester,
   ) async {