Minor fixes.

frontend/src/app/components/HealthStatus.tsx

@@ -10,7 +10,9 @@ export default function HealthStatus() {
     const checkHealth = async () => {
       try {
         setLoading(true);
-        const response = await fetch(`${process.env.BACKEND_URL}/health`);
+        const response = await fetch(`${process.env.BACKEND_URL}/health`, {
+          credentials: "include",
+        });
 
         if (!response.ok) {
           throw new Error(`Server responded with status: ${response.status}`);
@@ -19,7 +21,7 @@ export default function HealthStatus() {
         let data;
         try {
           data = await response.json();
-        } catch (jsonErr) {
+        } catch {
           setError("Response is not valid JSON");
           setHealth({});
           return;

frontend/src/app/contexts/AuthContext.tsx

@@ -46,7 +46,7 @@ export function AuthProvider({ children }: { children: ReactNode }) {
         let userData;
         try {
           userData = await response.json();
-        } catch (jsonErr) {
+        } catch {
           // 不是 JSON，降级处理
           setUser(null);
           setIsAuthenticated(false);