feat: Implement custom emojis, pinned comments, and thread locking features with schema updates and client-side logic.

public/s/js/comments.js

@@ -448,6 +448,27 @@ class CommentSystem {
             });
         }
 
+        // Lock Thread
+        const lockBtn = this.container.querySelector('#lock-thread-btn');
+        if (lockBtn) {
+            lockBtn.addEventListener('click', async () => {
+                const action = this.isLocked ? 'unlock' : 'lock';
+                if (!confirm(`Admin: ${action.toUpperCase()} this thread?`)) return;
+
+                try {
+                    const res = await fetch(`/api/comments/${this.itemId}/lock`, { method: 'POST' });
+                    const json = await res.json();
+                    if (json.success) {
+                        this.loadComments();
+                    } else {
+                        alert('Failed to lock/unlock: ' + (json.message || 'Error'));
+                    }
+                } catch (e) {
+                    alert('Error: ' + e);
+                }
+            });
+        }
+
         // Permalinks
         this.container.addEventListener('click', (e) => {
             if (e.target.classList.contains('comment-permalink')) {