fix: restore local token fallback and demo endpoint safety

Author: cursoragent

apps/web/src/lib/agent-endpoint.tsx

@@ -136,18 +136,18 @@ export function AgentEndpointProvider({
 	}, []);
 
 	const useDemo = useCallback(async () => {
-		if (typeof window !== "undefined") {
-			window.localStorage.setItem(STORAGE_KEY, "demo");
-		}
 		setBootingDemo(true);
 		try {
 			await startDemoWorker();
+			if (typeof window !== "undefined") {
+				window.localStorage.setItem(STORAGE_KEY, "demo");
+			}
+			setEndpoint(DEMO_ENDPOINT);
 		} catch (err) {
 			console.error("[demo] failed to start mock worker", err);
 		} finally {
 			setBootingDemo(false);
 		}
-		setEndpoint(DEMO_ENDPOINT);
 	}, []);
 
 	const useLocal = useCallback(() => {
@@ -186,8 +186,3 @@ export function useAgentEndpoint(): AgentEndpointContextValue {
 	}
 	return ctx;
 }
-
-/** Convenience hook for landing-page CTAs that don't care about the rest of the API. */
-export function useEnterDemo(): () => Promise<void> {
-	return useAgentEndpoint().useDemo;
-}

apps/web/src/lib/agent-provider.tsx

@@ -123,7 +123,7 @@ export function AgentProvider({
 
 	// Handle query token persistence and URL cleanup (runs after initial render)
 	useEffect(() => {
-		if (providedToken !== undefined) {
+		if (providedToken != null) {
 			return () => {
 				cleanupRef.current?.();
 				cleanupRef.current = null;

apps/web/src/lib/agent-sse-provider.tsx

@@ -89,10 +89,10 @@ export function AgentSSEProvider({
 	const registeredEventsRef = useRef<Map<string, EventListener>>(new Map());
 	const heartbeatTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
 
-	const resolvedToken = token !== undefined ? token : storedToken;
+	const resolvedToken = token ?? storedToken;
 
 	useEffect(() => {
-		if (token !== undefined) return;
+		if (token != null) return;
 		setStoredToken(localStorage.getItem(STORAGE_KEY));
 
 		const onStorage = (event: StorageEvent) => {