feat: enriched edit request system with side-by-side snapshots, calendar preloading, and admin review UI
Backend: - Add enriched response types (EditSnapshot, EnrichedEditRequest) with original vs proposed snapshots - Add 4 new GET endpoints for viewing edit requests (user and admin scoped) - Remove github.com/lib/pq dependency — use native PostgreSQL array scanning - Clean up edit requests, time blockers, and notifications on booking cancellation - Validate exceptional closed hours on admin approve (409 Conflict) - Notification upsert on edit request replace (no duplicate admin notifications) Frontend: - New user EditRequestModal with time/services/both modes and lunch protection - New admin EditRequestModal with side-by-side diff (date/time, services, notes) - Integrate edit requests into PendingApprovals card and notifications page - Preload 3 months of availability to prevent calendar snap-back - Apply lunch protection to isDateUnavailable in BookingFlow and BookingCreateModal - Fix accessibility: card list items use <button> instead of <div> Dev & Docs: - Seed edit requests in local-dev-2.sh - Update all Obsidian manuals with enriched edit request documentation - 42 new tests (438/441 passing)
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