App Layout: Accessibility

### Your use case

Found during testing theres a couple of accessibility enhancements we could add to the spaces bottom sheet for talkback

Spaces is just called "button" not Space Switching,
highlights 'image',
forward button,
when the bottom sheet is fully expanded it reads the background,

Happy to recreate these and add videos if needed :)

### Have you considered any alternatives?

_No response_

### Additional context

_No response_