feat(component): add star button to each comment with login prompt

src/components/CommentSection.vue

@@ -81,6 +81,35 @@ function openForm() {
   formOpen.value = true
 }
 
+const commentStarBusy = ref<Set<number>>(new Set())
+
+async function toggleCommentStar(comment: CommentResponse) {
+  if (!localStorage.getItem('token')) {
+    window.location.href = '/login'
+    return
+  }
+  const id = comment.id!
+  if (commentStarBusy.value.has(id)) return
+  commentStarBusy.value = new Set([...commentStarBusy.value, id])
+  const was = comment.hasStarred ?? false
+  comment.hasStarred = !was
+  comment.starCount = (comment.starCount ?? 0) + (was ? -1 : 1)
+  try {
+    if (was) {
+      await commentApi.apiCommentsIdStarDelete(id)
+    } else {
+      await commentApi.apiCommentsIdStarPost(id)
+    }
+  } catch {
+    comment.hasStarred = was
+    comment.starCount = (comment.starCount ?? 0) + (was ? 1 : -1)
+  } finally {
+    const next = new Set(commentStarBusy.value)
+    next.delete(id)
+    commentStarBusy.value = next
+  }
+}
+
 onMounted(load)
 </script>
 
@@ -98,6 +127,12 @@ onMounted(load)
             <span class="comment-time">{{ formatDate(comment.createdAt) }}</span>
           </div>
           <p class="comment-content">{{ comment.content }}</p>
+          <button class="comment-star" :class="{ starred: comment.hasStarred }" @click="toggleCommentStar(comment)">
+            <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="14" height="14">
+              <path d="M12 2l3.09 6.26L22 9.27l-5 4.87 1.18 6.88L12 17.77l-6.18 3.25L7 14.14 2 9.27l6.91-1.01L12 2z" fill="currentColor"/>
+            </svg>
+            <span>{{ comment.starCount ?? 0 }}</span>
+          </button>
         </div>
       </article>
     </div>
@@ -199,6 +234,29 @@ onMounted(load)
   word-break: break-word;
 }
 
+.comment-star {
+  display: inline-flex;
+  align-items: center;
+  gap: 3px;
+  margin-top: 6px;
+  border: none;
+  background: none;
+  color: var(--ac-text-disabled);
+  cursor: pointer;
+  font-size: 12px;
+  padding: 2px 6px;
+  border-radius: var(--song-radius-s);
+  transition: color var(--song-dur-1) var(--song-ease);
+}
+
+.comment-star:hover {
+  color: var(--ac-primary-ink);
+}
+
+.comment-star.starred {
+  color: var(--ac-primary);
+}
+
 .comment-write {
   margin-top: 8px;
   display: flex;