[codex] Add local demo data mode for visual QA

[B-EtterDigital]

Summary

• add NEXT_PUBLIC_VIBERANK_DEMO_DATA=1 to switch the app to a read-only local demo data layer
• include realistic leaderboard, profile, model breakdown, duplicate CLI alias, and hire-page rows for localhost UI review
• document the local visual-QA mode in .env.example and README.md
• add demo data tests while keeping the package test command compatible with the existing Node-based test loop

Why

Localhost without Supabase credentials currently renders an empty/error-backed board, which makes UI review blind. Demo mode gives maintainers a realistic local board without requiring production credentials.

Validation

• pnpm test — 31 passed, 0 failed
• GITHUB_ID=dummy GITHUB_SECRET=dummy NEXTAUTH_SECRET=dummy NEXTAUTH_URL=http://127.0.0.1:3003 NEXT_PUBLIC_VIBERANK_DEMO_DATA=1 pnpm build — passed
• GITHUB_ID=dummy GITHUB_SECRET=dummy NEXTAUTH_SECRET=dummy NEXTAUTH_URL=http://127.0.0.1:3003 NEXT_PUBLIC_SUPABASE_URL=https://example.supabase.co NEXT_PUBLIC_SUPABASE_ANON_KEY=dummy SUPABASE_SERVICE_ROLE_KEY=dummy pnpm build — passed
• Combined PR stack [codex] Fix leaderboard sorting, timelines, and duplicate claims #72-[codex] Add local demo data mode for visual QA #76 merged cleanly, pnpm test passed 75 checks, and demo-mode pnpm build passed
• Local visual QA on http://127.0.0.1:3003 with demo mode enabled:
  • /
  • /profile/B-EtterDigital
  • /hire
  • desktop and mobile screenshots captured locally
  • verified the leaderboard filter shows tool names (Claude, Codex, Gemini, OpenCode) rather than model names

Notes

• pnpm exec tsc --noEmit still reports existing upstream issues unrelated to this PR: unsupported eslint key in next.config.ts, missing MCP package dependencies, and pre-existing implicit-any errors in src/app/api/submit/route.ts.
• Demo data is read-only and only selected when NEXT_PUBLIC_VIBERANK_DEMO_DATA=1 is explicitly set.

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