feat(web): add appearance contrast control (#7906)

Co-authored-by: t3-code[bot] <269035359+t3-code[bot]@users.noreply.github.com>
Co-authored-by: maria <254055478+maria-rcks@users.noreply.github.com>
6e9c57f7bat3-code[bot] committed on 8/22/2026, 10:00:21 PM· committed by GitHubparent6c693ba
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