* Make `InternalButton` internal instead of private so it can be customised.
Also, change the `ButtonColors.contentColor` for text buttons to `LocalContentColor.current` by default.
* Add temporary color for Snackbar action label
* Implement `Snackbar` component based on Compound
* Propagate changes to all other components
* Use right Preview annotation config
* Move `ButtonVisuals` to their own file
* Update screenshots
* Make previews internal
* Update screenshots
* Set a custom token for contentColor in AppBars
* Change 'Label' to 'Action' in the previews
* Add changelog
* Update screenshots
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Co-authored-by: ElementBot <benoitm+elementbot@element.io>
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