Use @ctrl/tinycolor instead of tinycolor2

Editor assessment

The subject states the swap exactly: @ctrl/tinycolor replaces tinycolor2 in the theme-tools package. The theme-tools scope is a proper package noun, the feat type is defensible for adopting a maintained dependency, and both the old and new libraries are named, so the reader knows precisely what changed. The widely known rationale — tinycolor2 is unmaintained — is implicit rather than stated, and no body supplies it. No footers appear. The lowercase imperative phrasing is clean. Clear and self-sufficient. A one-line rationale on maintenance status would have completed the argument for the swap.