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>

frontend/src/components/EventList.vue

@@ -0,0 +1,79 @@
+<template>
+  <div class="event-list" role="list" aria-label="Your events">
+    <div v-for="event in sortedEvents" :key="event.eventToken" role="listitem">
+      <EventCard
+        :event-token="event.eventToken"
+        :title="event.title"
+        :relative-time="formatRelativeTime(event.dateTime)"
+        :is-past="isPast(event.dateTime)"
+        :event-role="getRole(event)"
+        @delete="requestDelete"
+      />
+    </div>
+    <ConfirmDialog
+      :open="!!pendingDeleteToken"
+      title="Remove event?"
+      message="This event will be removed from your list."
+      confirm-label="Remove"
+      cancel-label="Cancel"
+      @confirm="confirmDelete"
+      @cancel="cancelDelete"
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { useEventStorage, isValidStoredEvent } from '../composables/useEventStorage'
+import { formatRelativeTime } from '../composables/useRelativeTime'
+import EventCard from './EventCard.vue'
+import ConfirmDialog from './ConfirmDialog.vue'
+import type { StoredEvent } from '../composables/useEventStorage'
+
+const { getStoredEvents, removeEvent } = useEventStorage()
+
+const pendingDeleteToken = ref<string | null>(null)
+
+function requestDelete(eventToken: string) {
+  pendingDeleteToken.value = eventToken
+}
+
+function confirmDelete() {
+  if (pendingDeleteToken.value) {
+    removeEvent(pendingDeleteToken.value)
+  }
+  pendingDeleteToken.value = null
+}
+
+function cancelDelete() {
+  pendingDeleteToken.value = null
+}
+
+function isPast(dateTime: string): boolean {
+  return new Date(dateTime) < new Date()
+}
+
+function getRole(event: StoredEvent): 'organizer' | 'attendee' | undefined {
+  if (event.organizerToken) return 'organizer'
+  if (event.rsvpToken) return 'attendee'
+  return undefined
+}
+
+const sortedEvents = computed(() => {
+  const valid = getStoredEvents().filter(isValidStoredEvent)
+  const now = new Date()
+  const upcoming = valid.filter((e) => new Date(e.dateTime) >= now)
+  const past = valid.filter((e) => new Date(e.dateTime) < now)
+  upcoming.sort((a, b) => new Date(a.dateTime).getTime() - new Date(b.dateTime).getTime())
+  past.sort((a, b) => new Date(b.dateTime).getTime() - new Date(a.dateTime).getTime())
+  return [...upcoming, ...past]
+})
+</script>
+
+<style scoped>
+.event-list {
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-sm);
+}
+</style>