* Refine styles of menus, toasts, popovers, and modals
This is a reintroduction of https://github.com/matrix-org/matrix-react-sdk/pull/12247, with the difference that modal styles have now been refreshed as well.
* Restore the fixed heights of some dialogs
* Fix formatting and flaky screenshot
* Use h1 as first heading in dialogs
The dialog should be modal and therefore the only content active
on the screen, so the title of the dialog should be the top level.
Update snapshots & tests appropriately.
* Just customise the letter spacing on dialog titles
* Upgrade compound-web
I forgot to include this in https://github.com/matrix-org/matrix-react-sdk/pull/12209, which has caused avatar and username colors to be out of sync and sometimes revert to plain black/white.
* Update tests
* Update tests
* Use consistent colouring of username with avatar
* Upgrade Compound to fix Firefox issue
* Use the approapriate color shade for usernames
* Use the approapriate color shade for usernames
* Upgrade Compound
* Fix tests
* Move avatar to new compound implementation
* Make space avatars square
* Remove reference to the avatar initial CSS class
* remove references to mx_BaseAvatar_image
* Fixe test suites
* Fix accessbility violations
* Add ConfirmUserActionDialog test
* Fix tests
* Add FacePile test
* Fix items clipping in members list
* Fix user info avatar sizing
* Fix tests
