refactor(mobile): derive light-mode chip accents with themeColorWithContrast

Replace the hand-tuned light-surface accent table with the existing contrast
helper, so a new chip accent reads on light themes without a matching entry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
22527a3773Julius Marminge committed on 10/21/2026, 6:42:06 AMparent5a9c6a7
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