refactor(ConversationList): streamline conversation list handling and enhance unread count management

- Removed debug display for unread count in ConversationListRow to clean up UI.
- Updated updateConversationCacheUnreadCount to optionally handle myLastReadSeq for better synchronization of read status.
- Refactored message service to unify offset and cursor pagination methods, improving data fetching consistency.
- Introduced a new method to normalize unread counts based on read cursor, ensuring accurate display of unread messages.
- Consolidated conversation list source implementations to simplify remote data fetching logic.

src/stores/conversationListSources.ts

@@ -25,51 +25,28 @@ export interface IConversationListPagedSource {
   readonly hasMore: boolean;
 }
 
-/** 远端常规分页：GET /conversations?page=&page_size=（始终请求网络，避免走 getConversations 的本地短路） */
-export class NetworkOffsetConversationListPagedSource implements IConversationListPagedSource {
+/**
+ * 远端会话列表（offset 与 cursor 共用实现）
+ * 均通过 messageService.fetchRemoteConversationListPage 拉取并落库，行为一致。
+ */
+export class NetworkRemoteConversationListPagedSource implements IConversationListPagedSource {
   private nextPage = 1;
+  private nextCursor: string | null = null;
   private hasMoreAfterLastLoad = false;
   private loadedOnce = false;
   private readonly pageSize: number;
+  private readonly mode: RemoteConversationListSourceKind;
 
-  constructor(pageSize: number = CONVERSATION_LIST_PAGE_SIZE) {
+  constructor(
+    mode: RemoteConversationListSourceKind,
+    pageSize: number = CONVERSATION_LIST_PAGE_SIZE
+  ) {
+    this.mode = mode;
     this.pageSize = pageSize;
   }
 
   restart(): void {
     this.nextPage = 1;
-    this.hasMoreAfterLastLoad = false;
-    this.loadedOnce = false;
-  }
-
-  get hasMore(): boolean {
-    return this.loadedOnce && this.hasMoreAfterLastLoad;
-  }
-
-  async loadNext(): Promise<ConversationListPage> {
-    const response = await messageService.getConversations(this.nextPage, this.pageSize, true);
-    const items = response.list || [];
-    const totalPages = Math.max(0, response.total_pages ?? 0);
-    const currentPage = response.page ?? this.nextPage;
-    this.hasMoreAfterLastLoad = totalPages > 0 && currentPage < totalPages;
-    this.nextPage = currentPage + 1;
-    this.loadedOnce = true;
-    return { items, hasMore: this.hasMoreAfterLastLoad };
-  }
-}
-
-/** 远端游标接口 */
-export class NetworkCursorConversationListPagedSource implements IConversationListPagedSource {
-  private nextCursor: string | null = null;
-  private hasMoreAfterLastLoad = false;
-  private loadedOnce = false;
-  private readonly pageSize: number;
-
-  constructor(pageSize: number = CONVERSATION_LIST_PAGE_SIZE) {
-    this.pageSize = pageSize;
-  }
-
-  restart(): void {
     this.nextCursor = null;
     this.hasMoreAfterLastLoad = false;
     this.loadedOnce = false;
@@ -80,16 +57,22 @@ export class NetworkCursorConversationListPagedSource implements IConversationLi
   }
 
   async loadNext(): Promise<ConversationListPage> {
-    const response = await messageService.getConversationsCursor(
-      this.nextCursor == null
-        ? { page_size: this.pageSize }
-        : { cursor: this.nextCursor, page_size: this.pageSize }
-    );
-    const items = response.list || [];
-    this.nextCursor = response.next_cursor ?? null;
-    this.hasMoreAfterLastLoad = Boolean(response.has_more && response.next_cursor != null);
+    const result = await messageService.fetchRemoteConversationListPage({
+      mode: this.mode,
+      pageSize: this.pageSize,
+      ...(this.mode === 'offset'
+        ? { page: this.nextPage }
+        : { cursor: this.nextCursor }),
+    });
+
+    this.hasMoreAfterLastLoad = result.hasMore;
+    if (this.mode === 'offset') {
+      this.nextPage = result.nextPage ?? this.nextPage + 1;
+    } else {
+      this.nextCursor = result.nextCursor ?? null;
+    }
     this.loadedOnce = true;
-    return { items, hasMore: this.hasMoreAfterLastLoad };
+    return { items: result.items, hasMore: result.hasMore };
   }
 }
 
@@ -120,14 +103,12 @@ export class SqliteConversationListPagedSource implements IConversationListPaged
   }
 }
 
-/** 未注入 remote 时，按类型创建默认远端源 */
+/** 远端会话列表分页策略 */
 export type RemoteConversationListSourceKind = 'cursor' | 'offset';
 
 export function createRemoteConversationListSource(
   kind: RemoteConversationListSourceKind,
   pageSize: number = CONVERSATION_LIST_PAGE_SIZE
 ): IConversationListPagedSource {
-  return kind === 'offset'
-    ? new NetworkOffsetConversationListPagedSource(pageSize)
-    : new NetworkCursorConversationListPagedSource(pageSize);
+  return new NetworkRemoteConversationListPagedSource(kind, pageSize);
 }