refactor(community): extract comment store and post/comment API adapters

store/posts.ts

@@ -17,6 +17,8 @@ interface CreatePostInput {
 interface PostState {
   posts: Post[]
   createPost: (input: CreatePostInput) => Post
+  togglePostLike: (postId: string) => void
+  incrementCommentCount: (postId: string) => void
 }
 
 export const usePostStore = create<PostState>((set) => ({
@@ -45,4 +47,22 @@ export const usePostStore = create<PostState>((set) => ({
 
     return post
   },
+  togglePostLike: (postId) =>
+    set((state) => ({
+      posts: state.posts.map((post) => {
+        if (post.id !== postId) return post
+        const liked = !post.liked
+        return {
+          ...post,
+          liked,
+          likeCount: liked ? post.likeCount + 1 : Math.max(0, post.likeCount - 1),
+        }
+      }),
+    })),
+  incrementCommentCount: (postId) =>
+    set((state) => ({
+      posts: state.posts.map((post) =>
+        post.id === postId ? { ...post, commentCount: post.commentCount + 1 } : post,
+      ),
+    })),
 }))