fix: 修复新建对话时因缺少会话ID导致配置绑定失败的问题 (#5292)

* fix:尝试修改

* fix:添加详细日志

* fix:进行详细修改，并添加日志

* fix:删除所有日志

* fix: 增加安全访问函数

- 给 localStorage 访问加了 try/catch + 可用性判断：dashboard/src/utils/chatConfigBinding.ts:13
- 新增 getFromLocalStorage/setToLocalStorage（在受限存储/无痕模式下异常时回退/忽略）
- getStoredDashboardUsername() / getStoredSelectedChatConfigId() 改为走安全读取：dashboard/src/utils/chatConfigBinding.ts:36       - 新增 setStoredSelectedChatConfigId()，写入失败静默忽略：dashboard/src/utils/chatConfigBinding.ts:44
- 把 ConfigSelector.vue 里直接 localStorage.getItem/setItem 全部替换为上述安全方法：dashboard/src/components/chat/ConfigSelector.vue:81
- 已重新跑过 pnpm run typecheck，通过。

* rm:删除个人用的文档文件

* Revert "rm:删除个人用的文档文件"

This reverts commit 0fceee0543.

* rm:删除个人用的文档文件

* rm:删除个人用的文档文件

dashboard/src/utils/chatConfigBinding.ts

@@ -0,0 +1,60 @@
+export const CHAT_SELECTED_CONFIG_STORAGE_KEY = 'chat.selectedConfigId';
+
+export type ChatMessageType = 'FriendMessage' | 'GroupMessage';
+
+export interface WebchatUmoDetails {
+  platformId: string;
+  messageType: ChatMessageType;
+  username: string;
+  sessionKey: string;
+  umo: string;
+}
+
+function getFromLocalStorage(key: string, fallback: string): string {
+  try {
+    if (typeof localStorage === 'undefined') {
+      return fallback;
+    }
+    const value = localStorage.getItem(key);
+    return value == null ? fallback : value;
+  } catch {
+    return fallback;
+  }
+}
+
+function setToLocalStorage(key: string, value: string): void {
+  try {
+    if (typeof localStorage === 'undefined') {
+      return;
+    }
+    localStorage.setItem(key, value);
+  } catch {
+    // Ignore storage errors (e.g. private mode / restricted storage).
+  }
+}
+
+export function getStoredDashboardUsername(): string {
+  return getFromLocalStorage('user', '').trim() || 'guest';
+}
+
+export function getStoredSelectedChatConfigId(): string {
+  return getFromLocalStorage(CHAT_SELECTED_CONFIG_STORAGE_KEY, '').trim() || 'default';
+}
+
+export function setStoredSelectedChatConfigId(configId: string): void {
+  setToLocalStorage(CHAT_SELECTED_CONFIG_STORAGE_KEY, configId);
+}
+
+export function buildWebchatUmoDetails(sessionId: string, isGroup = false): WebchatUmoDetails {
+  const platformId = 'webchat';
+  const username = getStoredDashboardUsername();
+  const messageType: ChatMessageType = isGroup ? 'GroupMessage' : 'FriendMessage';
+  const sessionKey = `${platformId}!${username}!${sessionId}`;
+  return {
+    platformId,
+    messageType,
+    username,
+    sessionKey,
+    umo: `${platformId}:${messageType}:${sessionKey}`
+  };
+}