refactor(FoldersSidebar): remove unused TagIcon import and related tag variable for cleaner code

src/components/notes/FoldersSidebar.tsx

@@ -11,7 +11,6 @@ import {
   Trash2,
   ChevronRight,
   ChevronDown,
-  Tag as TagIcon,
 } from 'lucide-react';
 import { createFolder, updateFolder, deleteFolder } from '@/actions/folders';
 
@@ -48,7 +47,6 @@ function FolderItem({
   const [isExpanded, setIsExpanded] = useState(true);
   const [isDragOver, setIsDragOver] = useState(false);
   const hasChildren = folder.children && folder.children.length > 0;
-  const tag = availableTags.find((t) => t.id === folder.tagId);
 
   const handleEdit = (e: React.MouseEvent) => {
     e.stopPropagation();