[Feature] Load configurable scenarios on mobile

[JunchenMeteor]

Summary

• read enabled practice scenarios from the existing Supabase scenarios table for authenticated requests
• keep the shared scenario catalog as the signed-out, offline, and request-failure fallback
• expose one runtime scenario list through mobile SessionContext for home, session, and history screens
• map legacy database icon names to the existing emoji presentation
• document scenario editing in Supabase

Test plan

• npm run lint
• npx vitest run (22 files, 154 tests)
• npm run build --workspace @meteorvoice/web
• npm run typecheck --workspace @meteorvoice/mobile
• npm --workspace @meteorvoice/mobile exec expo config -- --type public
• npx expo export --platform ios

Closes #359

[vercel]

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Project	Deployment	Actions	Updated (UTC)
meteorvoice	Ready	Preview, Comment	Jul 11, 2026 3:30pm