feat: add UI primitive library — Button, Card, Input, Badge, Modal, Toast

- Add cn() utility for class merging in lib/utils.ts
- Button: primary/secondary/ghost/danger variants, sm/md/lg sizes, disabled/loading states
- Card: gradient-card background with optional header/footer slots
- Input: text/email/password/number types with label, error, helper text, focus ring
- Badge: default/success/warning/error/info variants
- Modal: Portal-based dialog with focus trap, ESC/backdrop close, animations
- Toast: ToastProvider context with show/dismiss/auto-dismiss and variant support
- Barrel export via index.ts
- 46 unit tests across all primitives
- Configure vitest with vite-plugin-solid for JSX support

pnpm-lock.yaml

@@ -66,6 +66,9 @@ importers:
       jsdom:
         specifier: ^29.1.1
         version: 29.1.1
+      vite-plugin-solid:
+        specifier: ^2.11.12
+        version: 2.11.12(solid-js@1.9.13)(vite@7.3.3(@types/node@25.9.1)(jiti@2.7.0)(lightningcss@1.32.0)(terser@5.48.0))
       vitest:
         specifier: ^4.1.5
         version: 4.1.7(@types/node@25.9.1)(@vitest/coverage-v8@4.1.7)(jsdom@29.1.1)(vite@7.3.3(@types/node@25.9.1)(jiti@2.7.0)(lightningcss@1.32.0)(terser@5.48.0))