b5971c9618d96d770ddf8af9616d271b97d6864b
Replace all hardcoded colors across 10 CSS files with CSS variables defined in index.css. Dark mode (default) uses the existing navy/purple palette, light mode uses Notion-inspired warm neutrals from the design tokens (--bg-primary: #FFFFFF, --bg-sidebar: #F7F6F3, --text-primary: #37352F). Toggle button (sun/moon) in the sidebar header persists preference to localStorage. An inline script in index.html applies the saved theme before React mounts to prevent flash. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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