Fix build: export usePermissions from store.jsx

frontend/src/store.jsx

@@ -81,4 +81,13 @@ export function useApp() {
   const ctx = useContext(AppContext);
   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,
+  };
 }
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