feat(ui): 更新底栏图标与播放加载视觉

test/player/player_fullscreen_test.dart

@@ -313,7 +313,7 @@ void main() {
         .first;
     expect(loadingOverlay, findsOneWidget);
     expect(tester.widget<IgnorePointer>(loadingOverlay).ignoring, isTrue);
-    expect(tester.getSize(loadingOverlay), const Size(40, 40));
+    expect(tester.getSize(loadingOverlay), const Size(56, 36));
     expect(
       tester
           .widget<AnimatedOpacity>(
@@ -327,26 +327,29 @@ void main() {
     );
     expect(
       tester.getSize(find.byKey(const Key('player-loading-surface'))),
-      const Size(40, 40),
+      const Size(56, 36),
     );
     expect(
       tester.getSize(find.byKey(const Key('player-entry-loading'))),
-      const Size(20, 20),
+      const Size(48, 29),
     );
     expect(
-      tester
-          .widget<CircularProgressIndicator>(
-            find.byKey(const Key('player-entry-loading')),
-          )
-          .color,
-      Colors.white,
+      find.descendant(
+        of: loadingOverlay,
+        matching: find.byType(CircularProgressIndicator),
+      ),
+      findsNothing,
+    );
+    expect(find.text('Loading'), findsNothing);
+    expect(find.byKey(const Key('player-entry-loading-track')), findsNothing);
+    expect(
+      find.byKey(const Key('player-entry-loading-highlight')),
+      findsNothing,
     );
     final loadingSurface = tester.widget<Container>(
       find.byKey(const Key('player-loading-surface')),
     );
-    final decoration = loadingSurface.decoration! as BoxDecoration;
-    expect(decoration.color, AppColors.refreshIndicatorSurface);
-    expect(decoration.borderRadius, BorderRadius.circular(20));
+    expect(loadingSurface.decoration, isNull);
     expect(
       find.descendant(of: loadingOverlay, matching: find.byType(ColoredBox)),
       findsNothing,