fix: reduce dashboard request churn

frontend/src/app/dashboard/components/RequestHistory.tsx

@@ -30,10 +30,6 @@ export function RequestHistory() {
 			socket.off("request_updated", refresh);
 		};
 	}, [socket, status]);
-	useEffect(() => {
-		const id = setInterval(load, 15000);
-		return () => clearInterval(id);
-	}, [status]);
 
 	const filtered = requests.filter(
 		(r) =>

frontend/src/app/dashboard/page.tsx

@@ -43,17 +43,18 @@ export default function DashboardPage() {
 			router.push("/login");
 			return;
 		}
-		loadData();
+		loadWalletAndPending();
+		loadCosts();
 	}, [isAuthenticated, router]);
 	useEffect(() => {
 		const id = setInterval(() => {
-			if (isAuthenticated) loadData();
-		}, 15000);
+			if (isAuthenticated) loadWalletAndPending();
+		}, 30000);
 		return () => clearInterval(id);
 	}, [isAuthenticated]);
 	useEffect(() => {
 		if (!socket) return;
-		const refresh = () => loadData();
+		const refresh = () => loadWalletAndPending();
 		socket.on("credits_earned", refresh);
 		socket.on("bonus_received", refresh);
 		socket.on("credits_spent", refresh);
@@ -66,15 +67,13 @@ export default function DashboardPage() {
 		};
 	}, [socket]);
 
-	const loadData = async () => {
+	const loadWalletAndPending = async () => {
 		try {
-			const [walletRes, costsRes, reqRes] = await Promise.all([
+			const [walletRes, reqRes] = await Promise.all([
 				api.get("/wallet"),
-				overseerApi.getCosts(),
 				userApi.getRequests(1, 10, "PENDING"),
 			]);
 			setWallet(walletRes.data);
-			setRequestCosts(costsRes.data);
 			setPendingRequests(reqRes.data.requests || []);
 		} catch {
 			toast.error("Failed to load dashboard");
@@ -83,6 +82,15 @@ export default function DashboardPage() {
 		}
 	};
 
+	const loadCosts = async () => {
+		try {
+			const costsRes = await overseerApi.getCosts();
+			setRequestCosts(costsRes.data);
+		} catch {
+			/* ignore */
+		}
+	};
+
 	const handleLogout = async () => {
 		try {
 			await authApi.logout();