feat: 添加后台任务测试通知功能，优化滑动删除交互体验

app/auth/login.tsx

@@ -138,20 +138,6 @@ export default function LoginScreen() {
     }
   }, [appleAvailable, router, searchParams?.redirectParams, searchParams?.redirectTo]);
 
-  const onGuestLogin = useCallback(() => {
-    // 游客继续：若有 redirect 则前往，无则返回
-    const to = searchParams?.redirectTo as string | undefined;
-    const paramsJson = searchParams?.redirectParams as string | undefined;
-    let parsedParams: Record<string, any> | undefined;
-    if (paramsJson) {
-      try { parsedParams = JSON.parse(paramsJson); } catch { }
-    }
-    if (to) {
-      router.replace({ pathname: to, params: parsedParams } as any);
-    } else {
-      router.back();
-    }
-  }, [router, searchParams?.redirectParams, searchParams?.redirectTo]);
 
   // 登录按钮不再因未勾选协议而禁用，仅在加载中禁用