refactor kiro auth flow and share account password service

sidepanel/sidepanel.html

@@ -273,7 +273,7 @@
         <span class="data-label">账户密码</span>
         <div class="input-with-icon">
           <input type="password" id="input-password" class="data-input data-input-with-icon"
-            placeholder="codex密码，留空则自动生成" />
+            placeholder="账户密码，留空则自动生成" />
           <button id="btn-toggle-password" class="input-icon-btn" type="button" aria-label="显示密码" title="显示密码"></button>
         </div>
       </div>

sidepanel/sidepanel.js

@@ -13154,15 +13154,16 @@ stepsList?.addEventListener('click', async (event) => {
     if (step === gpcCreateStep && !(await ensureGpcApiKeyReadyForStart())) {
       return;
     }
-    if (step === 3) {
-      if (inputPassword.value !== (latestState?.customPassword || '')) {
-        await chrome.runtime.sendMessage({
-          type: 'SAVE_SETTING',
-          source: 'sidepanel',
-          payload: { customPassword: inputPassword.value },
-        });
-        syncLatestState({ customPassword: inputPassword.value });
-      }
+    const shouldPersistSharedPassword = nodeId === 'fill-password' || nodeId === 'kiro-fill-password';
+    if (shouldPersistSharedPassword && inputPassword.value !== (latestState?.customPassword || '')) {
+      await chrome.runtime.sendMessage({
+        type: 'SAVE_SETTING',
+        source: 'sidepanel',
+        payload: { customPassword: inputPassword.value },
+      });
+      syncLatestState({ customPassword: inputPassword.value });
+    }
+    if (nodeId === 'fill-password') {
       if (shouldExecuteStep3WithSignupPhoneIdentity(latestState)) {
         const response = await sendSidepanelMessage({ type: 'EXECUTE_NODE', source: 'sidepanel', payload: { nodeId } });
         if (response?.error) {