fix: reuse external browsers for element pickup

src/main/browser/session.ts

@@ -166,6 +166,16 @@ export class BrowserSession implements BrowserLike {
   }
 
   /** 当前会话是否为外部浏览器 */
+  /** 会话底层 CDP 是否已断开（缓存清理用） */
+  get closed(): boolean {
+    return this.transport.closed;
+  }
+
+  /** 缓存键，外部会话排序用 */
+  get sessionKey(): string {
+    return this.externalKey;
+  }
+
   get isExternal(): boolean {
     return this.external !== null;
   }
@@ -1370,6 +1380,16 @@ export async function externalBrowserSession(options: ExternalBrowserOptions): P
   return BrowserSession.createExternal(options);
 }
 
+export function listExternalSessions(): BrowserSession[] {
+  return [...externalSessionCache().values()]
+    .filter((session) => session.isExternal && !session.closed)
+    .sort((left, right) => right.sessionKey.localeCompare(left.sessionKey));
+}
+
+export function latestExternalSession(): BrowserSession | null {
+  return listExternalSessions()[0] || null;
+}
+
 export function hasBrowserSession(): boolean {
   return Boolean(globalThis.__rpaBrowserWindow && !globalThis.__rpaBrowserWindow.isDestroyed());
 }