feat(ui): 更新底栏图标与播放加载视觉

test/player/player_loading_overlay_test.dart

@@ -0,0 +1,73 @@
+// Author: fruit.com.cn
+// 职责：验证剧集播放页 YMB 入场 loading 的品牌视觉、运动和减少动画行为。
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/l10n/app_localizations.dart';
+import 'package:fruitshorts/pages/player/widgets/player_loading_overlay.dart';
+
+const _surface = Key('player-loading-surface');
+const _logo = Key('player-entry-loading');
+const _motion = Key('player-entry-loading-motion');
+
+void main() {
+  testWidgets('should_show_ymb_motion_without_circular_spinner', (
+    tester,
+  ) async {
+    await _pump(tester);
+
+    expect(find.byType(CircularProgressIndicator), findsNothing);
+    expect(find.byKey(_surface), findsOneWidget);
+    expect(find.byKey(_logo), findsOneWidget);
+    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,
+    );
+    expect(find.byType(ShaderMask), findsOneWidget);
+    expect(tester.getSize(find.byKey(_surface)), const Size(56, 36));
+    expect(tester.getSize(find.byKey(_logo)), const Size(48, 29));
+    expect(tester.widget<Container>(find.byKey(_surface)).decoration, isNull);
+
+    final initialScale = _scaleOf(tester);
+    await tester.pump(const Duration(milliseconds: 300));
+    expect(_scaleOf(tester), isNot(initialScale));
+  });
+
+  testWidgets('should_keep_loading_static_when_motion_is_disabled', (
+    tester,
+  ) async {
+    await _pump(tester, disableAnimations: true);
+
+    final initialScale = _scaleOf(tester);
+    await tester.pump(const Duration(milliseconds: 300));
+    expect(_scaleOf(tester), initialScale);
+    expect(find.byKey(_logo), findsOneWidget);
+    expect(find.text('Loading'), findsNothing);
+  });
+}
+
+double _scaleOf(WidgetTester tester) {
+  return tester.widget<Transform>(find.byKey(_motion)).transform.storage.first;
+}
+
+Future<void> _pump(
+  WidgetTester tester, {
+  bool disableAnimations = false,
+}) async {
+  await tester.pumpWidget(
+    MaterialApp(
+      locale: const Locale('en'),
+      localizationsDelegates: AppLocalizations.localizationsDelegates,
+      supportedLocales: AppLocalizations.supportedLocales,
+      home: MediaQuery(
+        data: MediaQueryData(disableAnimations: disableAnimations),
+        child: Scaffold(
+          body: Center(
+            child: PlayerLoadingOverlay(opacity: 1, onFadeEnd: () {}),
+          ),
+        ),
+      ),
+    ),
+  );
+}