fix: Make trashcan and zoom controls accessible#9768
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The basics
The details
Resolves
Fixes #9042
Proposed Changes
This PR makes the trashcan and zoom controls accessible via the keyboard. It does this by making them tabstops rather than part of the navigation order, since having to navigate through them with the arrow keys repeatedly would be annoying and frequently unneeded. When focused via the tab key, Enter/Space can be used to act upon them in the same way as a click. Each control has its ARIA role set to
buttonand an appropriate label set. When the trash can is acted upon, the first block in its flyout will be focused.