- Upgrade stylelint and plugin
- Change ruleset to a explicit one, with all deprecated rules removed
- Fix new issues detected by value validation
For `overflow: overlay` see
https://github.com/stylelint/stylelint/issues/6667
* Push system-ui further down the stack, fix #12966
* Fix Firefox showing U+300x in emoji font and more
* Revert emoji font and fix long-standing Safari bug
* Exclude Safari emoji fix above 1.25x zoom
* Minor correctness/typo fix, affects only legacy platforms
* Emoji consistency for monospace (e.g. EasyMDE)
* Override paradigm; macOS/iOS-specific metric fix
* Move whitespace fix to font-face
* Handle metric calculation errors with Firefox
* One last workaround for aliased fonts in Linux
