Add design artifacts for view event feature (007)

Spec, research, data model, API contract, implementation plan, and
task breakdown for the public event detail page.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

specs/007-view-event/quickstart.md

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+# Quickstart: View Event Landing Page (007)
+
+## What this feature does
+
+Adds a public event detail page at `/events/:token`. Guests open a shared link and see:
+- Event title, date/time (with IANA timezone), description, location
+- Count of confirmed attendees (no names)
+- "Event has ended" state for expired events
+- "Event not found" for invalid tokens
+- Skeleton shimmer while loading
+
+## Prerequisites
+
+- US-1 (Create Event) is implemented — Event entity, JPA persistence, POST endpoint exist.
+- No RSVP model yet — attendee count returns 0 until RSVP feature is built.
+
+## Key changes
+
+### Backend
+
+1. **OpenAPI**: Add `GET /events/{token}` endpoint + `GetEventResponse` schema. Add `timezone` field to `CreateEventRequest`, `CreateEventResponse`, and `GetEventResponse`.
+2. **Domain**: Add `timezone` (String) to `Event.java`.
+3. **Persistence**: Add `timezone` column to `EventJpaEntity`, Liquibase migration.
+4. **Use case**: New `GetEventUseCase` (inbound port) + implementation in `EventService`.
+5. **Controller**: `EventController` implements `getEvent()` — maps to `GetEventResponse`, computes `expired` and `attendeeCount`.
+
+### Frontend
+
+1. **API types**: Regenerate `schema.d.ts` from updated OpenAPI spec.
+2. **EventDetailView.vue**: New view component — fetches event by token, renders detail card.
+3. **Router**: Replace `EventStubView` import at `/events/:token` with `EventDetailView`.
+4. **States**: Loading (skeleton shimmer), loaded, expired, not-found, server-error (retry button).
+5. **Create form**: Send `timezone` field (auto-detected via `Intl.DateTimeFormat`).
+
+### Testing
+
+- Backend: Unit tests for `GetEventUseCase`, controller tests for GET endpoint (200, 404).
+- Frontend: Unit tests for EventDetailView (all states).
+- E2E: Playwright tests with MSW mocks for all states (loaded, expired, not-found, error).