feat: add library entry point for design system package

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/design-system/index.ts

@@ -0,0 +1,11 @@
+import './tokens.css'
+import './reset.css'
+
+export * from './primitives'
+export * from './composites'
+export * from './layout'
+export * from './providers/ThemeProvider'
+export * from './providers/CommandPaletteProvider'
+export * from './providers/GlobalFilterProvider'
+export * from './utils/hashColor'
+export * from './utils/timePresets'