Menu items would be welcome

**Is your feature request related to a problem? Please describe.**
No.

**Describe the solution you'd like**
That in the menu of the desktop scrcpy app the actions are available, e.g. zoom, screen off, rotate, pull notifications, etc.
Now I have to remember keyboard shortcuts which is very 'msdos' like.

Start by reviewing the desktop scrcpy app's menu handling and the existing keyboard-shortcut actions for zoom, screen off, rotation, and notifications. Done means the requested actions are available from the application menu, with their behavior matching the current shortcuts.

Written by the indexing model from the issue text.