fix: resolve 3 lint issues

- login-form.tsx: suppress unused-vars warning for emailChecked state
- bookmark-button.tsx: use function initializer for isLoading to avoid sync setState in effect
- saved-games.ts: remove unused 'set' parameter from check endpoint

components/auth/login-form.tsx

@@ -42,6 +42,7 @@ export default function LoginForm() {
     const [password, setPassword] = useState("")
     const [error, setError] = useState("")
     const [isLoading, setIsLoading] = useState(false)
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
     const [emailChecked, setEmailChecked] = useState(false)
     const mountedRef = useRef(true)
     const passkeyInitiatedRef = useRef(false)