Admin interface to review, filter, and batch-invite the 95 pre-registrants from Baby Ghosts. Accept-invitation page pre-fills their data and collects circle, pronouns, motivation, contribution tier, and agreement before creating their member record.
Add comprehensive testing covering 420 unit/handler tests across 24 Vitest files, 9 Playwright E2E specs, accessibility scans, and visual regression. Includes GitHub Actions CI, Husky pre-push hook, and TESTING.md docs.
