feat: Sort document tags alphabetically and prevent hover/focus on empty folder menu items.

frontend/src/documents/DocumentSummarySection.tsx

@@ -472,7 +472,11 @@ const DocumentSummarySection: React.FC<DocumentSummarySectionProps> = ({
       id: tag.id,
       label: tag.label,
       color: tag.color ?? tagLookupById.get(tag.id)?.color ?? null,
-    }));
+    })).sort((a, b) => {
+      const labelA = (a.label || '').toLowerCase();
+      const labelB = (b.label || '').toLowerCase();
+      return labelA.localeCompare(labelB);
+    });
   }, [document?.tags, tagLookupById]);
 
   const resolvedCorrespondents = useMemo(() => {