style: 统一全站深色视觉

test/theme/dark_theme_smoke_test.dart

@@ -65,7 +65,7 @@ void main() {
     final theme = Theme.of(context);
     expect(theme.brightness, Brightness.dark);
     expect(theme.scaffoldBackgroundColor, AppColors.ink);
-    expect(theme.appBarTheme.backgroundColor, AppColors.card);
+    expect(theme.appBarTheme.backgroundColor, AppColors.transparent);
     expect(theme.cardTheme.color, AppColors.card);
 
     final card = tester.widget<Card>(find.byKey(const Key('dark-smoke-card')));