fix: 恢复登录手机号和短信倒计时

ai_knowledge_base_v2/apps/user-client/src/components/LoginPanel.vue

@@ -21,6 +21,7 @@ const emit = defineEmits<{
 
 const COUNTDOWN_SECONDS = 60;
 const COUNTDOWN_PREFIX = "ai-kb-sms-countdown:";
+const PHONE_STORAGE_KEY = "ai-kb-login-phone";
 const PHONE_PATTERN = /^1[3-9]\d{9}$/;
 
 const phone = ref("");
@@ -56,7 +57,11 @@ const sendButtonText = computed(() => {
 let countdownTimer: ReturnType<typeof setInterval> | null = null;
 let toastTimer: ReturnType<typeof setTimeout> | null = null;
 
-onMounted(() => restoreCountdown());
+onMounted(() => {
+  const storedPhone = window.localStorage.getItem(PHONE_STORAGE_KEY) ?? "";
+  if (PHONE_PATTERN.test(storedPhone)) phone.value = storedPhone;
+  restoreCountdown();
+});
 onUnmounted(() => {
   stopCountdownTimer();
   if (toastTimer) clearTimeout(toastTimer);
@@ -64,6 +69,7 @@ onUnmounted(() => {
 
 watch(phone, () => {
   code.value = sanitizeDigits(code.value, 6);
+  if (phoneValid.value) window.localStorage.setItem(PHONE_STORAGE_KEY, phone.value);
   restoreCountdown();
 });
 
@@ -82,6 +88,7 @@ function sanitizeDigits(value: string, maxLength: number) {
 function clearPhone() {
   phone.value = "";
   phoneTouched.value = false;
+  window.localStorage.removeItem(PHONE_STORAGE_KEY);
 }
 
 async function sendCode() {