feat: accessibility improvements

[YousefED]

After a consultation with accessibility experts, this PR implements some important improvements in terms of accessibility:

• Better keyboard navigation: -- the editor can be exited with "esc" -- menus (formatting toolbar, link menu, image panel) can be tabbed into with "tab", exited with "esc"
• the suggestion menu is now a combobox / listbox aria element of the editor. The active item is marked using virtual focus (activedescendent), which should bring better support for screenreaders. (we need to test this a bit more extensively)
• All buttons have the right aria-label attributes, toggle buttons have aria-pressed

As part of this PR, we also:

• moved responsibility of closing menus from the plugins to Floating-UI, with the useDismiss hook
• cleaned up some CSS
• added stronger typescript support which enforces all props to be used (or at least destructured) when implementing a UI layer. This makes sure we get compile errors when new props are being added, but not implemented by all UI layers

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
blocknote	✅ Ready (Inspect)	Visit Preview	May 5, 2024 3:45pm
blocknote-website	✅ Ready (Inspect)	Visit Preview	May 5, 2024 3:45pm