Auto 正在真正运行或重试时，步骤按钮和手动完成按钮不会放开。

Auto 处于暂停等待邮箱时，可以继续，也可以显式接管为手动。
Step 1 和 Step 9 不提供手动完成同步。
Step 3 会要求已知邮箱和密码；Step 8 会要求已经捕获 localhostUrl。

content/signup-page.js

@@ -11,6 +11,7 @@ chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
     || message.type === 'STEP8_FIND_AND_CLICK'
     || message.type === 'PREPARE_LOGIN_CODE'
     || message.type === 'RESEND_VERIFICATION_CODE'
+    || message.type === 'GET_MANUAL_COMPLETION_STATE'
   ) {
     resetStopState();
     handleCommand(message).then((result) => {
@@ -22,6 +23,11 @@ chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
         return;
       }
 
+      if (message.type === 'GET_MANUAL_COMPLETION_STATE') {
+        sendResponse({ error: err.message });
+        return;
+      }
+
       if (message.type === 'STEP8_FIND_AND_CLICK') {
         log(`步骤 8：${err.message}`, 'error');
         sendResponse({ error: err.message });
@@ -53,6 +59,8 @@ async function handleCommand(message) {
       return await prepareLoginCodeFlow();
     case 'RESEND_VERIFICATION_CODE':
       return await resendVerificationCode(message.step);
+    case 'GET_MANUAL_COMPLETION_STATE':
+      return getManualCompletionState();
     case 'STEP8_FIND_AND_CLICK':
       return await step8_findAndClick();
   }
@@ -145,6 +153,25 @@ function findOneTimeCodeLoginTrigger() {
   return null;
 }
 
+function findRegisterEntryTrigger() {
+  const candidates = document.querySelectorAll(
+    'a, button, [role="button"], [role="link"], input[type="button"], input[type="submit"]'
+  );
+
+  for (const el of candidates) {
+    if (!isVisibleElement(el)) continue;
+    if (el.disabled || el.getAttribute('aria-disabled') === 'true') continue;
+
+    const text = getActionText(el);
+    const href = el.getAttribute('href') || '';
+    if ((text && /sign\s*up|register|create\s*account|注册/i.test(text)) || /signup|register/i.test(href)) {
+      return el;
+    }
+  }
+
+  return null;
+}
+
 function findResendVerificationCodeTrigger({ allowDisabled = false } = {}) {
   const candidates = document.querySelectorAll(
     'button, a, [role="button"], [role="link"], input[type="button"], input[type="submit"]'
@@ -394,6 +421,18 @@ function isStep5Ready() {
   );
 }
 
+function isCredentialsPageReady() {
+  const emailInput = document.querySelector(
+    'input[type="email"], input[name="email"], input[name="username"], input[id*="email"], input[placeholder*="email" i]'
+  );
+  if (emailInput && isVisibleElement(emailInput)) {
+    return true;
+  }
+
+  const passwordInput = document.querySelector('input[type="password"]');
+  return Boolean(passwordInput && isVisibleElement(passwordInput));
+}
+
 function getPageTextSnapshot() {
   return (document.body?.innerText || document.body?.textContent || '')
     .replace(/\s+/g, ' ')
@@ -443,6 +482,29 @@ function isStep8Ready() {
   return OAUTH_CONSENT_PAGE_PATTERN.test(getPageTextSnapshot());
 }
 
+function getManualCompletionState() {
+  if (isStep8Ready()) {
+    return { stage: 'consent', summary: '已进入 OAuth 授权同意页', url: location.href };
+  }
+  if (isAddPhonePageReady()) {
+    return { stage: 'add_phone', summary: '已进入手机号页面', url: location.href };
+  }
+  if (isStep5Ready()) {
+    return { stage: 'profile', summary: '已进入姓名/生日页面', url: location.href };
+  }
+  if (isVerificationPageStillVisible()) {
+    return { stage: 'verification', summary: '仍停留在验证码页面', url: location.href };
+  }
+  if (isCredentialsPageReady()) {
+    return { stage: 'credentials', summary: '已进入邮箱或密码输入页面', url: location.href };
+  }
+  if (findRegisterEntryTrigger()) {
+    return { stage: 'register', summary: '仍停留在注册入口页面', url: location.href };
+  }
+
+  return { stage: 'unknown', summary: '无法识别当前认证页状态', url: location.href };
+}
+
 async function waitForVerificationSubmitOutcome(step, timeout) {
   const resolvedTimeout = timeout ?? (step === 7 ? 30000 : 12000);
   const start = Date.now();