Fix build: export usePermissions from store.jsx

frontend/src/store.jsx

@@ -82,3 +82,12 @@ export function useApp() {
   if (!ctx) throw new Error("useApp must be used within AppProvider");
   return ctx;
 }
+
+export function usePermissions() {
+  const { state } = useApp();
+  // Provide defaults if user permissions aren't loaded yet
+  return state.user?.permissions || {
+    can_use_knowledge_base: true,
+    can_use_gitlab: true,
+  };
+}
\ No newline at end of file