Add event list feature (009-list-events)

Enable users to see all their saved events on the home screen, sorted
by date with upcoming events first. Key capabilities:

- EventCard with title, relative time display, and organizer/attendee
  role badge
- Sortable EventList with past-event visual distinction (faded style)
- Empty state when no events are stored
- Swipe-to-delete gesture with confirmation dialog
- Floating action button for quick event creation
- Rename router param :token → :eventToken across all views
- useRelativeTime composable (Intl.RelativeTimeFormat)
- useEventStorage: add validation, removeEvent(), reactive versioning
- Full E2E and unit test coverage for all new components

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

specs/009-list-events/data-model.md

@@ -0,0 +1,99 @@
+# Data Model: Event List on Home Page
+
+**Feature**: 009-list-events | **Date**: 2026-03-08
+
+## Entities
+
+### StoredEvent (existing — no changes)
+
+The `StoredEvent` interface in `frontend/src/composables/useEventStorage.ts` already contains all fields needed for the event list feature.
+
+```typescript
+interface StoredEvent {
+  eventToken: string        // Required — UUID, used for navigation
+  organizerToken?: string   // Present if user created this event
+  title: string             // Required — displayed on card
+  dateTime: string          // Required — ISO 8601, used for sorting + relative time
+  expiryDate: string        // Stored but not displayed in list view
+  rsvpToken?: string        // Present if user RSVP'd to this event
+  rsvpName?: string         // User's name at RSVP time
+}
+```
+
+### Validation Rules
+
+An event entry is considered **valid** for display if all of:
+- `eventToken` is a non-empty string
+- `title` is a non-empty string
+- `dateTime` is a non-empty string that parses to a valid `Date`
+
+Invalid entries are silently excluded from the list (FR-010).
+
+### Derived Properties (computed at render time)
+
+| Property | Derivation |
+|----------|-----------|
+| `isPast` | `new Date(dateTime) < new Date()` |
+| `isOrganizer` | `organizerToken !== undefined` |
+| `isAttendee` | `rsvpToken !== undefined && organizerToken === undefined` |
+| `relativeTime` | `Intl.RelativeTimeFormat` applied to `dateTime` vs now |
+| `detailRoute` | `/events/${eventToken}` |
+
+### Sorting Order
+
+1. **Upcoming events** (`dateTime >= now`): ascending by `dateTime` (soonest first)
+2. **Past events** (`dateTime < now`): descending by `dateTime` (most recently passed first)
+
+### Composable Extension
+
+The `useEventStorage` composable needs one new function:
+
+```typescript
+function removeEvent(eventToken: string): void {
+  const events = readEvents().filter((e) => e.eventToken !== eventToken)
+  writeEvents(events)
+}
+```
+
+Returned alongside existing functions from `useEventStorage()`.
+
+## State Transitions
+
+```
+localStorage read
+       │
+       ▼
+  Parse JSON ──(error)──► empty array
+       │
+       ▼
+  Validate entries ──(invalid)──► silently excluded
+       │
+       ▼
+  Split: upcoming / past
+       │
+       ▼
+  Sort each group
+       │
+       ▼
+  Concatenate ──► rendered list
+```
+
+### Remove Event Flow
+
+```
+User taps delete icon / swipes left
+       │
+       ▼
+  ConfirmDialog opens
+       │
+  ┌────┴────┐
+  │ Cancel  │  Confirm
+  │         │     │
+  │         ▼     ▼
+  │    removeEvent(token)
+  │         │
+  │         ▼
+  │    Event removed from localStorage
+  │    List re-renders (event disappears)
+  └────────────────────────────────┘
+```