Always highlight mentions in composer #7705
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On web, the composer only highlights mentions if they have been inserted by selecting one of the suggestions in the autocomplete dropdown. Mentions typed manually are not highlighted.
This PR reworks the autocomplete TipTap extension so it just adds text rather than creating an editor node with special styling. The highlighting is then left to the new FacetDecorator, which combines the previous LinkDecorator and TagDecorator and adds support for mentions also. Instead of duplicating the detection logic in @atproto/api, it just uses the facet detection RichText. This ensures that the highlighting code in the editor is identical to the actual facet detection used when creating the post.
This issue was originally reported in a comment on another composer-related PR: #7562 (comment).