feat(client): main 接入可切换三主题（启动恢复持久化选择）

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/lib/main.dart

@@ -10,7 +10,8 @@ import 'core/config/app_info.dart';
 import 'core/errors/error_reporter.dart';
 import 'core/platform/single_instance.dart' as single_instance;
 import 'core/router/app_router.dart';
-import 'core/theme/app_theme.dart';
+import 'core/theme/theme_controller.dart';
+import 'core/theme/themes.dart';
 import 'providers/connectivity_provider.dart';
 
 void main() {
@@ -99,6 +100,7 @@ class _JiuAppState extends ConsumerState<JiuApp> {
     // 路由 redirect 在 initialized=false 时返回 null（不重定向），
     // 初始化完成后 authState 变化触发 router refresh，redirect 重新执行
     WidgetsBinding.instance.addPostFrameCallback((_) async {
+      await ref.read(themeControllerProvider.notifier).restore();
       await ref.read(authStateProvider.notifier).restore();
       await ref.read(connectivityProvider.notifier).forceCheck();
     });
@@ -107,9 +109,10 @@ class _JiuAppState extends ConsumerState<JiuApp> {
   @override
   Widget build(BuildContext context) {
     final router = ref.watch(appRouterProvider);
+    final themeKey = ref.watch(themeControllerProvider);
     return MaterialApp.router(
       title: kDebugMode ? '岩美 [DEBUG]' : '岩美',
-      theme: AppTheme.light(),
+      theme: buildTheme(themeKey),
       routerConfig: router,
       debugShowCheckedModeBanner: false,
       localizationsDelegates: const [

client/test/theme/theme_switch_widget_test.dart

@@ -0,0 +1,30 @@
+// client/test/theme/theme_switch_widget_test.dart
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:jiu_client/core/theme/context_tokens.dart';
+import 'package:jiu_client/core/theme/themes.dart';
+import 'package:jiu_client/core/theme/theme_controller.dart';
+
+// 复刻 main.dart 的主题接线最小骨架，验证切 key → 主题色变化。
+void main() {
+  setUp(() => SharedPreferences.setMockInitialValues({}));
+
+  testWidgets('切换 themeController 改变 context.tokens.primary', (tester) async {
+    late WidgetRef capturedRef;
+    late Color seen;
+    await tester.pumpWidget(ProviderScope(child: Consumer(builder: (ctx, ref, _) {
+      capturedRef = ref;
+      final key = ref.watch(themeControllerProvider);
+      return MaterialApp(
+        theme: buildTheme(key),
+        home: Builder(builder: (c) { seen = c.tokens.primary; return const SizedBox(); }),
+      );
+    })));
+    expect(seen, const Color(0xFF2563AC)); // a
+    await capturedRef.read(themeControllerProvider.notifier).set('c');
+    await tester.pumpAndSettle();
+    expect(seen, const Color(0xFF7C1F2C)); // c 酒窖酒红
+  });
+}