Media Control Shortcuts

I think a useful addition would be to support Play/Pause, Next and Previous key support.

When connecting a USB or Bluetooth keyboard with media keys to a phone the buttons work as expected, but they don't seem to be passed through to the device when using scrcpy.

I'm not sure if it makes more sense to have a separate shortcut or to actually listen to the media keys themselves.

The issue does not name any files, tests, or entry points. Start by tracing how scrcpy handles keyboard input and how Android media keys are forwarded, then determine whether direct media-key handling or separate shortcuts is appropriate. Done means Play/Pause, Next, and Previous work through USB and Bluetooth keyboards.

Written by the indexing model from the issue text.