Add complete multi-theme dashboard system including:
- 8 selectable themes with persistent per-browser preferences
- Theme bootstrap script to prevent FOUC on page load
- 12+ reusable chart components (area, bar, donut, radial gauge, etc)
- Custom checkbox UI component
- New settings page for appearance customization
Other changes:
- Optimize supplier map API payload with getMappableSuppliers helper
- Add aria-label attributes to back buttons on detail pages for better accessibility
- Update next.config.ts to include new local development IP 192.168.1.128
- Update site manifest with all new favicon and PWA assets
- Fix styling and layout spacing in rewrite quote modal
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