Add testkit coverage for the Timmy economic peer endpoints (issue #45):
- T37: GET /api/identity/timmy — npub, pubkeyHex, zapCount shape assertions
- T38/T39: POST /api/identity/vouch auth guards (no token / invalid token → 401)
- Update TIMMY_TEST_PLAN.md with new test table rows
- Renumber former FUTURE T37-T40 stubs to T40-T43
Fix pre-existing mobile typecheck error: move slideStyles declaration before
the slides array in artifacts/mobile/app/onboarding.tsx to resolve TS2448/2454.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>