feat: 通知推送/免打扰偏好 + 饮食记录侧滑删除修复 + 聊天交互优化

- 通知: 新增推送开关/免打扰时段偏好持久化 + EF 迁移; 通知管线支持免打扰过滤
- 饮食: 侧滑删除 confirmDismiss 按方向放行(修复删不掉); 新增 diet_nutrition_widgets; 饮食录入页重构
- 聊天: 智能体胶囊点击锁防误触; 流式状态 select 优化; 卡片入场动画
- 主页: 消息列表提取 _HomeMessages + 侧滑手势打开抽屉
- 其他: api_client IP 适配; 通知/用药/饮食端点微调; 测试更新

health_app/test/chat_provider_test.dart

@@ -17,7 +17,7 @@ void main() {
     expect(messages, isEmpty);
   });
 
-  test('agent capsule inserts welcome when session is unchanged', () async {
+  test('agent capsule inserts welcome immediately', () {
     final container = ProviderContainer();
     addTearDown(container.dispose);
 
@@ -25,8 +25,6 @@ void main() {
         .read(chatProvider.notifier)
         .triggerAgent(ActiveAgent.diet, '营养助手');
 
-    await Future<void>.delayed(const Duration(milliseconds: 450));
-
     final messages = container.read(chatProvider).messages;
     expect(messages.map((m) => m.type), contains(MessageType.agentWelcome));
     expect(container.read(chatProvider).activeAgent, ActiveAgent.diet);
@@ -40,11 +38,8 @@ void main() {
 
       final notifier = container.read(chatProvider.notifier);
       notifier.triggerAgent(ActiveAgent.diet, '营养助手');
-      await Future<void>.delayed(const Duration(milliseconds: 120));
       notifier.triggerAgent(ActiveAgent.medication, '药管家');
 
-      await Future<void>.delayed(const Duration(milliseconds: 450));
-
       final welcomeAgents = container
           .read(chatProvider)
           .messages
@@ -56,4 +51,44 @@ void main() {
       expect(container.read(chatProvider).activeAgent, ActiveAgent.diet);
     },
   );
+
+  test('repeated tap on the same agent does not add another card', () async {
+    final container = ProviderContainer();
+    addTearDown(container.dispose);
+
+    final notifier = container.read(chatProvider.notifier);
+    notifier.triggerAgent(ActiveAgent.diet, '营养助手');
+    notifier.triggerAgent(ActiveAgent.diet, '营养助手');
+
+    expect(
+      container
+          .read(chatProvider)
+          .messages
+          .where((message) => message.type == MessageType.agentWelcome)
+          .length,
+      1,
+    );
+  });
+
+  test(
+    'different agent is accepted after the previous welcome appears',
+    () async {
+      final container = ProviderContainer();
+      addTearDown(container.dispose);
+
+      final notifier = container.read(chatProvider.notifier);
+      notifier.triggerAgent(ActiveAgent.diet, '营养助手');
+      await Future<void>.delayed(const Duration(milliseconds: 320));
+      notifier.triggerAgent(ActiveAgent.medication, '药管家');
+
+      expect(
+        container
+            .read(chatProvider)
+            .messages
+            .where((message) => message.type == MessageType.agentWelcome)
+            .map((message) => message.metadata?['agent']),
+        ['diet', 'medication'],
+      );
+    },
+  );
 }