feat(auth): 登录异常改为居中弹窗

lib/l10n/app_en.arb

@@ -435,6 +435,9 @@
   "authPasswordLength": "Password must be 8-64 characters",
   "authPasswordWeak": "Password needs both letters and numbers",
   "authNetworkError": "Network error, please try again",
+  "authLoginFailed": "Login failed",
+  "authRegisterFailed": "Registration failed",
+  "authErrorConfirm": "OK",
   "authSwitchToSignUp": "New here? Create an account",
   "authSwitchToSignIn": "Already have an account? Sign in",
   "authGateTitle": "Sign in to continue",