feat: 更新手机号输入框逻辑，确保手动输入值在执行步骤前被保存，避免被旧状态覆盖

tests/sidepanel-phone-verification-settings.test.js

@@ -136,10 +136,57 @@ test('sidepanel html exposes phone verification toggle and multi-provider SMS ro
 
 test('sidepanel source wires runtime signup phone field to background sync messages', () => {
   assert.match(sidepanelSource, /function getRuntimeSignupPhoneValue\(state = latestState\)/);
+  assert.match(sidepanelSource, /function shouldPreserveSignupPhoneInputValue\(stateSignupPhone = ''\)/);
   assert.match(sidepanelSource, /function syncSignupPhoneInputFromState\(state = latestState\)/);
+  assert.match(sidepanelSource, /async function persistSignupPhoneInputForAction\(\)/);
   assert.match(sidepanelSource, /type:\s*'SET_SIGNUP_PHONE_STATE'/);
-  assert.match(sidepanelSource, /type:\s*'SAVE_SIGNUP_PHONE'/);
+  assert.match(sidepanelSource, /final \? 'SAVE_SIGNUP_PHONE' : 'SET_SIGNUP_PHONE_STATE'/);
   assert.match(sidepanelSource, /message\.payload\.signupPhoneNumber !== undefined/);
+  assert.match(sidepanelSource, /await persistSignupPhoneInputForAction\(\);\s*await saveSettings/);
+  assert.match(sidepanelSource, /async function handleSkipStep\(step\)[\s\S]*await persistCurrentSettingsForAction\(\);/);
+  assert.match(sidepanelSource, /inputSignupPhone\.addEventListener\('input'[\s\S]*signupPhoneInputDirty = true/);
+});
+
+test('runtime signup phone sync preserves active manual input until it is saved', () => {
+  const api = new Function(`
+let latestState = { signupMethod: 'phone', phoneVerificationEnabled: true, signupPhoneNumber: '+441111111111' };
+let signupPhoneInputDirty = true;
+let signupPhoneInputFocused = true;
+const inputSignupPhone = { value: '+442222222222' };
+const rowSignupPhone = { style: { display: 'none' } };
+const inputPhoneVerificationEnabled = { checked: true };
+const document = { activeElement: inputSignupPhone };
+function getSelectedSignupMethod() { return 'phone'; }
+${extractFunction('normalizeSignupMethod')}
+${extractFunction('getRuntimeSignupPhoneValue')}
+${extractFunction('getSignupPhoneInputValue')}
+${extractFunction('shouldPreserveSignupPhoneInputValue')}
+${extractFunction('syncSignupPhoneInputFromState')}
+return {
+  inputSignupPhone,
+  rowSignupPhone,
+  syncSignupPhoneInputFromState,
+  getDirty: () => signupPhoneInputDirty,
+  setFocused: (value) => { signupPhoneInputFocused = Boolean(value); document.activeElement = value ? inputSignupPhone : null; },
+};
+`)();
+
+  api.syncSignupPhoneInputFromState({
+    signupMethod: 'phone',
+    phoneVerificationEnabled: true,
+    signupPhoneNumber: '+441111111111',
+  });
+  assert.equal(api.inputSignupPhone.value, '+442222222222');
+  assert.equal(api.rowSignupPhone.style.display, '');
+  assert.equal(api.getDirty(), true);
+
+  api.setFocused(false);
+  api.syncSignupPhoneInputFromState({
+    signupMethod: 'phone',
+    phoneVerificationEnabled: true,
+    signupPhoneNumber: '+441111111111',
+  });
+  assert.equal(api.inputSignupPhone.value, '+441111111111');
 });
 
 test('hero sms country helpers keep empty summary state and expose removable order handling', () => {