* Improve readability of badges and pills
Badges will now always use light theme colors so that they become white-on-gray in both themes, and the contrast of pills has been increased so that they use primary action colors as the background.
* Fix tests
This changes the styles of buttons, other form controls, and tabs in settings to:
1. Improve their usage of semantic colors, so that they adapt correctly to custom themes
2. Make them more visually coherent with the new Compound design system, as we integrate more of it into the app
This is a re-introduction of https://github.com/matrix-org/matrix-react-sdk/pull/12241 with the difference that we're now using our branding colors again on form colors, and buttons have become rounded to match the appearance of new Compound buttons.
* Enable custom themes to theme Compound
* Remove the now redundant username color variables
They are replaced by the Compound theming options (specifically, username colors can be themed by changing the color of Compound's decorative color tokens).
* Use new semantic tokens for username colors
To match the tokens now used by the Compound Web avatar component
* Fix incorrect lock icon
* Update screenshots
* Integrate compound design tokens
The icons should not be included in this repo, and should live in the compound design token repo, but for simplicity sake at this phase of the integration they will be added here
* Pareto color pass on the light theme
* bugfixes in the light color pass
* Compound color pass dark theme
* Compound color pass high contrast
* Fix typo
* fix tooltip
* Fix PR feedback
* fix composer button mixin
* Normalise some of the auth page colors
* Update based on figma feedback
* lintfix
* regenerate theme index
* Fix cypress tests
Removed the CSS assertions in the room header as it overlaps with the Percy snapshot
* fix more e2e tests
* update colors based on feedback
* fix color pass
* Fix theme overrides
* Restore -transparent
* fix color mapping
* Final colour pass update
* Do not consume compound colors directly
* rethemedex
* Update pass
* Final tweaks
* a11y pass
* scope opacity to checkbox and not label
* Add missing customisations var for theming
* lintfix
* remove unwanted test
Robin