add comment to handleClickOutside in useDropdowns

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: akolson

contentcuration/contentcuration/frontend/shared/views/TipTapEditor/TipTapEditor/composables/useDropdowns.js

@@ -79,6 +79,8 @@ export function useDropdowns() {
 
   const containerRef = ref(null);
 
+  // Each instance checks only its own container so
+  // clicking one dropdown's trigger closes the other.
   const handleClickOutside = event => {
     if (!containerRef.value || containerRef.value.contains(event.target)) {
       return;