feat(web): add modular theme library (#5226)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Julius Marminge <julius0216@outlook.com>
Co-authored-by: maria-rcks <maria@kuuro.net>
Co-authored-by: Julius Marminge <jmarminge@gmail.com>
85b1734d4dWout Stiens committed on 8/7/2026, 8:37:43 AM· committed by GitHubparent3ffe84f
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