Re-point the design tokens to the approved brief (docs/discovery/04):
- green brand accent from #3ba31f (contrast-tuned per theme; white-on-green AA)
- warm-leaning neutrals; genuine white light theme; warm-charcoal dark (not pure black)
- 8px base radius; Inter-preferred font stack; static green ramp for utilities
- dark-first default for new users
Also re-skins the legacy styles.css palette so the current app adopts the brand.
Verified: frontend builds clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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