style(theme): 客户端切换深色视觉风格

test/home/home_nav_ui_test.dart

@@ -52,9 +52,9 @@ void main() {
     final bar = tester.widget<Container>(barFinder);
     final decoration = bar.decoration as BoxDecoration;
     final border = decoration.border as Border;
-    // 首页 feed 用深色导航。
-    expect(decoration.color, Colors.black);
-    expect(border.top.color, Colors.white12);
+    // 所有页面统一深色导航。
+    expect(decoration.color, AppColors.bar);
+    expect(border.top.color, AppColors.border);
     expect(
       tester
           .widget<Text>(
@@ -65,7 +65,7 @@ void main() {
           )
           .style
           ?.color,
-      Colors.white70,
+      AppColors.navUnselected,
     );
     expect(
       tester
@@ -100,10 +100,10 @@ void main() {
     await tester.tap(find.byKey(const Key('tab-theater')));
     await tester.pumpAndSettle();
     expect(haptics.selectionClicks, 1);
-    final lightBar = tester.widget<Container>(barFinder);
-    final lightDecoration = lightBar.decoration as BoxDecoration;
-    expect(lightDecoration.color, AppColors.bar.withValues(alpha: 0.95));
-    expect((lightDecoration.border as Border).top.color, AppColors.border);
+    final theaterBar = tester.widget<Container>(barFinder);
+    final theaterDecoration = theaterBar.decoration as BoxDecoration;
+    expect(theaterDecoration.color, AppColors.bar.withValues(alpha: 0.96));
+    expect((theaterDecoration.border as Border).top.color, AppColors.border);
     await tester.tap(find.byKey(const Key('tab-theater')));
     await tester.pumpAndSettle();
     expect(haptics.selectionClicks, 1);