feat(ZEE-29): implement design system, dark mode, and JSON content management

- Add comprehensive design system with CSS variables, animations, and utility classes
- Implement dark mode with ThemeProvider (system preference + manual toggle)
- Create JSON-based content management system in src/content/
- Update all pages to use structured JSON content
- Add ThemeProvider component with theme toggle button
- Update Header with glass effect and animated mobile menu
- Update Footer with dark mode support
- Update documentation (README.md, CLAUDE.md, knowledge.md, proto/README.md)
- Sync with Linear (ZEE-29 completed)

proto/tsconfig.json

@@ -7,9 +7,9 @@
     "strict": true,
     "noEmit": true,
     "esModuleInterop": true,
+    "resolveJsonModule": true,
     "module": "esnext",
     "moduleResolution": "bundler",
-    "resolveJsonModule": true,
     "isolatedModules": true,
     "jsx": "preserve",
     "incremental": true,