Add support for statusBarHidden(:)

[dfabulich]

This one was surprisingly tricky. Partly because the default animation for hiding the status bar is mindbogglingly bad.

Here's how it looked with a naive hide/show implementation: a slow 1-second fade out, followed by a non-animated layout shift.

Screen_recording_20260403_191618.webm

And here's how it looks in this PR, with animations disabled. Much better, IMO.

Screen_recording_20260403_193033.webm

The other reason this was surprisingly tricky was that the API for disabling animations seems to be buggy. You have to ask for an animation controller with a callback from controlWindowInsetsAnimation , but if you make the call "too early" it simply doesn't work. There's a callback that you're supposed to wait for first, onControllableInsetsChanged, but that doesn't fire unless you've first waited for the view to be attached with View.OnAttachStateChangeListener, and even when it does fire, controlWindowInsetsAnimation still doesn't work that early.

The other reason it was surprisingly tricky was that the status bar automatically shows back up when the window loses focus (when you open the "recents"/"overview" app-switcher screen with the square button on the emulator). When that happens, the animation controller is cancelled, and you have to request a new one. SystemOverlays.swift is 70 lines of extremely hard-earned code.

Skip Pull Request Checklist:

• REQUIRED: I have signed the Contributor Agreement
• REQUIRED: I have tested my change locally with swift test
• OPTIONAL: I have tested my change on an iOS simulator or device
• OPTIONAL: I have tested my change on an Android emulator or device
• REQUIRED: I have checked whether this change requires a corresponding update in the Skip Fuse UI repository (link related PR if applicable)
  Add support for statusBarHidden(:) skip-fuse-ui#97
• OPTIONAL: I have added an example of any UI changes in the Showcase sample app
  Status bar hiding skipapp-showcase#86
  Status bar hiding skipapp-showcase-fuse#56

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[dfabulich]

Found a bug…