➕ Add auto rotate with device orientation

I would like to propose the addition of a very useful feature which is auto rotate on device orientation change,

So for example when the device rotates to landscape it becomes full screen and when the device is in portrait mode it gets out of fullscreen

The issue names no files, tests, or entry points. Start by locating Chewie's existing fullscreen and device-orientation handling, then trace how landscape and portrait transitions are detected. Done means orientation changes consistently switch fullscreen state as described, with behavior verified in both orientations.

Written by the indexing model from the issue text.