feat: implement sandbox mode

feat: implement Metro-style Windows Phone mobile responsive UI

Show fullscreen link warning when loaded inside iframe wrapper

Fix TypeScript compilation types for Supabase proxy wrapper

Implement dynamic runtime configuration to fetch Supabase secrets from backend

Pass Supabase keys as build arguments instead of hardcoding them

Add fallback Supabase config to prevent client crash during cloud build

Configure AlgoSpaced for Hugging Face Spaces deployment