fix: 尝试修复同实例多窗口时点击超时，修复 Gemini 无法选择模型 (ref #30, ref #31)

src/utils/asyncMutex.js

@@ -0,0 +1,34 @@
+/**
+ * @fileoverview 轻量异步互斥锁
+ * @description 保证同一时刻只有一个 async 任务持有锁，用于防止同一浏览器实例的多个 Worker 并发操作鼠标。
+ */
+
+export class AsyncMutex {
+    constructor() {
+        this._queue = [];
+        this._locked = false;
+    }
+
+    /**
+     * 获取锁，返回释放函数
+     * @returns {Promise<() => void>}
+     */
+    acquire() {
+        return new Promise(resolve => {
+            const tryAcquire = () => {
+                if (!this._locked) {
+                    this._locked = true;
+                    resolve(() => {
+                        this._locked = false;
+                        if (this._queue.length > 0) {
+                            this._queue.shift()();
+                        }
+                    });
+                } else {
+                    this._queue.push(tryAcquire);
+                }
+            };
+            tryAcquire();
+        });
+    }
+}