feat: 统一首页与推荐搜索入口

lib/pages/discover/widgets/discover_search_results.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 
 import '../../../core/data/models/drama.dart';
 import '../../../core/formatting/error_text.dart';
+import '../../../core/theme/app_colors.dart';
 import '../../../core/widgets/empty_state.dart';
 import '../../../l10n/app_localizations.dart';
 import 'drama_grid.dart';
@@ -38,7 +39,15 @@ class DiscoverSearchResults extends StatelessWidget {
     if (loading) {
       return const Padding(
         padding: EdgeInsets.symmetric(vertical: 80),
-        child: Center(child: CircularProgressIndicator(strokeWidth: 2)),
+        child: Center(
+          child: SizedBox.square(
+            dimension: 20,
+            child: CircularProgressIndicator(
+              strokeWidth: 2,
+              color: AppColors.textPrimary,
+            ),
+          ),
+        ),
       );
     }
     final message = error;