feat: 隐藏窗口自带应用菜单栏，清理相关死代码

src/preload/index.ts

@@ -15,15 +15,7 @@ const api = {
   showInFolder: (filePath: string): Promise<boolean> =>
     ipcRenderer.invoke('file:show-in-folder', filePath),
   setClipboard: (text: string): Promise<boolean> =>
-    ipcRenderer.invoke('clipboard:write', text),
-  /** 订阅顶部菜单命令，返回取消订阅函数 */
-  onMenuCommand: (callback: (cmd: string) => void): (() => void) => {
-    const listener = (_e: unknown, cmd: string): void => callback(cmd)
-    ipcRenderer.on('menu:command', listener)
-    return () => {
-      ipcRenderer.removeListener('menu:command', listener)
-    }
-  }
+    ipcRenderer.invoke('clipboard:write', text)
 }
 
 export type DiffLensApi = typeof api