feat(ProcessPostUseCase, HomeScreen, PostDetailScreen, PostService): implement share count synchronization after post sharing

- Added applyShareCountUpdate method in ProcessPostUseCase to synchronize share counts across post lists and details.
- Updated sharePost method in PostService to return the latest shares_count from the server.
- Modified share handling in HomeScreen and PostDetailScreen to utilize the new share count synchronization logic after a successful share operation.
- Enhanced error handling for share operations to improve user feedback.

src/core/usecases/ProcessPostUseCase.ts

@@ -333,6 +333,35 @@ class ProcessPostUseCase {
     });
   }
 
+  /**
+   * 分享计数上报成功后，同步各列表与详情中的分享数
+   */
+  applyShareCountUpdate(postId: string, sharesCount: number): void {
+    this.postsState.forEach((state, key) => {
+      const index = state.posts.findIndex((p) => p.id === postId);
+      if (index !== -1) {
+        const newPosts = [...state.posts];
+        const cur = newPosts[index];
+        newPosts[index] = {
+          ...cur,
+          sharesCount,
+          shares_count: sharesCount,
+        };
+        this.updatePostsState(key, { posts: newPosts });
+      }
+    });
+    const detail = this.getPostDetailState(postId);
+    if (detail.post) {
+      this.updatePostDetailState(postId, {
+        post: {
+          ...detail.post,
+          sharesCount,
+          shares_count: sharesCount,
+        },
+      });
+    }
+  }
+
   // ==================== 帖子列表操作 ====================
 
   /**

src/screens/home/HomeScreen.tsx

@@ -336,7 +336,10 @@ export const HomeScreen: React.FC = () => {
   const handleShare = async (post: Post) => {
     if (!post?.id) return;
     try {
-      await postService.sharePost(post.id);
+      const res = await postService.sharePost(post.id, { channel: 'copy_link' });
+      if (res.ok && res.shares_count != null) {
+        processPostUseCase.applyShareCountUpdate(post.id, res.shares_count);
+      }
     } catch (shareError) {
       console.error('上报分享次数失败:', shareError);
     }

src/screens/home/PostDetailScreen.tsx

@@ -514,7 +514,15 @@ export const PostDetailScreen: React.FC = () => {
   const handleShare = useCallback(async () => {
     if (!post?.id) return;
     try {
-      await postService.sharePost(post.id);
+      const res = await postService.sharePost(post.id, { channel: 'copy_link' });
+      if (res.ok && res.shares_count != null) {
+        setPost((prev) =>
+          prev
+            ? { ...prev, shares_count: res.shares_count!, sharesCount: res.shares_count! }
+            : null
+        );
+        processPostUseCase.applyShareCountUpdate(post.id, res.shares_count);
+      }
     } catch (error) {
       console.error('上报分享次数失败:', error);
     }

src/services/postService.ts

@@ -250,14 +250,24 @@ class PostService {
     }
   }
 
-  // 分享帖子
+  /** 上报分享成功；返回服务端最新 shares_count 供界面同步 */
-  async sharePost(postId: string): Promise<boolean> {
+  async sharePost(
+    postId: string,
+    body?: { channel?: string }
+  ): Promise<{ ok: boolean; shares_count?: number }> {
     try {
-      const response = await api.post(`/posts/${postId}/share`);
+      const response = await api.post<{ success: boolean; shares_count: number }>(
-      return response.code === 0;
+        `/posts/${postId}/share`,
+        body && body.channel ? { channel: body.channel } : undefined
+      );
+      if (response.code !== 0) {
+        return { ok: false };
+      }
+      const n = response.data?.shares_count;
+      return { ok: true, shares_count: typeof n === 'number' ? n : undefined };
     } catch (error) {
       console.error('分享帖子失败:', error);
-      return false;
+      return { ok: false };
     }
   }