fix(web): style Antigravity download progress with accessible system colors (#21874)

Co-authored-by: MONKE2525E <221282747+MONKE2525E@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
6a00484478Julius Marminge committed on 10/19/2026, 11:18:34 PM· committed by GitHubparentafa42e6
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