Replace ~30 hardcoded dark hex colors in folk-wallet-viewer with --rs-*
CSS variables so rWallet adapts to both light and dark themes. Warm up
the global light palette from pure white to off-white tones.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Blocking <head> script restores canvas-theme from localStorage
with prefers-color-scheme fallback (no FOUC)
- New theme.css with CSS custom properties for dark/light
- Removed data-theme from body/header/tab-row (now on <html>)
- Theme toggle writes to documentElement instead of body
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>