Recreate activities on screenLayout change

[JimmyJichi]

Fixes #4255

Tested on Pixel 9 Pro Fold.

Before

screen-20240918-003325.mp4

After

screen-20240918-005909.mp4

[connyduck]

If it only was that easy 🥺
This should only be done once MainActivity has a ViewModel, otherwise it will reload on every layout change. But this is my top priority, I'll add that soon and then merge this PR.

[JimmyJichi]

This should only be done once MainActivity has a ViewModel, otherwise it will reload on every layout change.

I can see a brief reload animation, but the timeline stays where it was. I'd argue that's acceptable. Definitely better than having a broken layout.

output.webm

[connyduck]

I started working on adding a ViewModel.

Can you please remove the whole android:configChanges from both Activities?

[connyduck]

thx