Fix PR 3 review findings [skip ci]

launcher/src/components/PlayerProfileModal.svelte

@@ -88,9 +88,11 @@
   }
 
   async function handleLikePost(post: UserPost) {
+    if (post.liked_by_me) return;
     try {
-      await invoke('like_user_post', { postId: post.id });
-      post.likes_count += 1;
+      const liked = await invoke<boolean>('like_user_post', { postId: post.id });
+      if (liked) post.likes_count += 1;
+      post.liked_by_me = true;
     } catch (e: any) {
       toast(e?.message ?? 'Failed to update like', 'error');
     }