Examples: showcase app #21

REQUIREMENTS §18.

• Vite + React + TS app in examples/ consuming the workspace package
• One showcase page per component (all variants, sizes, states) with copyable code; auto-discovered so groups don't conflict
• Global toolbar: light/dark, LTR/RTL, en/dv, primary colour picker, density
• Design foundations page (R3.10) and theme builder (R9.7)
• Realistic mock data in Dhivehi + English
• Deployed to GitHub Pages on push to main; used as Playwright target