feat(message): add conversation notification mute feature

Add notification mute functionality for conversations with the following changes:

- Add notification_muted field to ConversationResponse and related DTOs
- Add notificationMutedMap to message store for tracking mute state
- Add setConversationNotificationMuted API method
- Integrate mute toggle in GroupInfoScreen and PrivateChatInfoScreen
- Skip system notifications for muted conversations
- Suppress vibration for muted conversations in WS handler
- Clean up selected mentions when @mentions are removed from text

Chore changes:
- Update PostCard bookmark icon from 'bookmark' to 'star'
- Refine card styles across AppsScreen, MaterialsScreen, and SubjectMaterialsScreen
- Improve week selector scrolling to center selected week in ScheduleScreen

src/services/message/messageService.ts

@@ -274,6 +274,12 @@ class MessageService {
     });
   }
 
+  async setConversationNotificationMuted(conversationId: string, notificationMuted: boolean): Promise<void> {
+    await api.put(`/conversations/${encodeURIComponent(conversationId)}/notification_muted`, {
+      notification_muted: notificationMuted,
+    });
+  }
+
   // ==================== 消息相关 ====================
 
   /**

src/services/notification/systemNotificationService.ts

@@ -10,6 +10,8 @@ import type { WSChatMessage, WSNotificationMessage, WSAnnouncementMessage } from
 import { extractTextFromSegments } from '@/types/dto';
 import { getNotificationPreferencesSync } from './notificationPreferences';
 import { vibrateOnMessage } from '../platform/messageVibrationService';
+import { useMessageStore } from '@/stores/message/store';
+import { normalizeConversationId } from '@/stores/message/store';
 
 // 通知渠道配置
 const CHANNEL_ID = 'default';
@@ -207,9 +209,12 @@ class SystemNotificationService {
       // 判断是否是聊天消息（通过 segments 字段）
       if ('segments' in message) {
         const chatMsg = message as WSChatMessage;
-        const body = extractTextFromSegments(chatMsg.segments);
+        const conversationId = normalizeConversationId(chatMsg.conversation_id);
+        const isNotificationMuted = useMessageStore.getState().isNotificationMuted(conversationId);
+        if (isNotificationMuted) {
+          return;
+        }
         void chatMsg;
-        void body;
         await this.showChatNotification(chatMsg);
       } else {
         const notifMsg = message as WSNotificationMessage | WSAnnouncementMessage;