Add temporal grouping to event list (Today/This Week/Next Week/Later/Past)

Group events into five temporal sections with section headers, date subheaders,
and context-aware time display (clock time for upcoming, relative for past).
Includes new useEventGrouping composable, SectionHeader and DateSubheader
components, full unit and E2E test coverage.

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

frontend/src/components/__tests__/DateSubheader.spec.ts

@@ -0,0 +1,17 @@
+import { describe, it, expect } from 'vitest'
+import { mount } from '@vue/test-utils'
+import DateSubheader from '../DateSubheader.vue'
+
+describe('DateSubheader', () => {
+  it('renders the date label as an h3', () => {
+    const wrapper = mount(DateSubheader, { props: { label: 'Wed, 12 Mar' } })
+    const h3 = wrapper.find('h3')
+    expect(h3.exists()).toBe(true)
+    expect(h3.text()).toBe('Wed, 12 Mar')
+  })
+
+  it('applies the date-subheader class', () => {
+    const wrapper = mount(DateSubheader, { props: { label: 'Fri, 14 Mar' } })
+    expect(wrapper.find('.date-subheader').exists()).toBe(true)
+  })
+})

frontend/src/components/__tests__/EventCard.spec.ts

@@ -73,4 +73,28 @@ describe('EventCard', () => {
     await wrapper.find('.event-card__delete').trigger('click')
     expect(wrapper.emitted('delete')).toEqual([['abc-123']])
   })
+
+  it('displays clock time when timeDisplayMode is clock', () => {
+    const wrapper = mountCard({
+      timeDisplayMode: 'clock',
+      dateTime: '2026-03-11T18:30:00',
+    })
+    const timeText = wrapper.find('.event-card__time').text()
+    // Locale-dependent: could be "18:30" or "06:30 PM"
+    expect(timeText).toMatch(/(?:18.30|6.30\s*PM)/i)
+  })
+
+  it('displays relative time when timeDisplayMode is relative', () => {
+    const wrapper = mountCard({
+      relativeTime: '3 days ago',
+      timeDisplayMode: 'relative',
+      dateTime: '2026-03-08T10:00:00',
+    })
+    expect(wrapper.find('.event-card__time').text()).toBe('3 days ago')
+  })
+
+  it('falls back to relativeTime when timeDisplayMode is not set', () => {
+    const wrapper = mountCard({ relativeTime: 'in 3 days' })
+    expect(wrapper.find('.event-card__time').text()).toBe('in 3 days')
+  })
 })

frontend/src/components/__tests__/EventList.spec.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
 import { mount } from '@vue/test-utils'
 import { createRouter, createMemoryHistory } from 'vue-router'
 import EventList from '../EventList.vue'
@@ -11,10 +11,15 @@ const router = createRouter({
   ],
 })
 
+// Fixed "now": Wednesday, 2026-03-11 12:00
+const NOW = new Date(2026, 2, 11, 12, 0, 0)
+
 const mockEvents = [
-  { eventToken: 'past-1', title: 'Past Event', dateTime: '2025-01-01T10:00:00Z', expiryDate: '' },
-  { eventToken: 'future-1', title: 'Future Event', dateTime: '2027-06-15T10:00:00Z', expiryDate: '' },
-  { eventToken: 'future-2', title: 'Soon Event', dateTime: '2027-01-01T10:00:00Z', expiryDate: '' },
+  { eventToken: 'past-1', title: 'Past Event', dateTime: '2026-03-01T10:00:00', expiryDate: '' },
+  { eventToken: 'later-1', title: 'Later Event', dateTime: '2027-06-15T10:00:00', expiryDate: '' },
+  { eventToken: 'today-1', title: 'Today Event', dateTime: '2026-03-11T18:00:00', expiryDate: '' },
+  { eventToken: 'week-1', title: 'This Week Event', dateTime: '2026-03-13T10:00:00', expiryDate: '' },
+  { eventToken: 'nextweek-1', title: 'Next Week Event', dateTime: '2026-03-16T10:00:00', expiryDate: '' },
 ]
 
 vi.mock('../../composables/useEventStorage', () => ({
@@ -33,9 +38,12 @@ vi.mock('../../composables/useEventStorage', () => ({
 
 vi.mock('../../composables/useRelativeTime', () => ({
   formatRelativeTime: (dateTime: string) => {
-    if (dateTime.startsWith('2025')) return '1 year ago'
+    if (dateTime.includes('03-01')) return '10 days ago'
     if (dateTime.includes('06-15')) return 'in 1 year'
-    return 'in 10 months'
+    if (dateTime.includes('03-11')) return 'in 6 hours'
+    if (dateTime.includes('03-13')) return 'in 2 days'
+    if (dateTime.includes('03-16')) return 'in 5 days'
+    return 'sometime'
   },
 }))
 
@@ -48,32 +56,85 @@ function mountList() {
 describe('EventList', () => {
   beforeEach(() => {
     vi.useFakeTimers()
-    vi.setSystemTime(new Date('2026-03-08T12:00:00Z'))
+    vi.setSystemTime(NOW)
   })
 
-  it('renders all valid events', () => {
+  afterEach(() => {
+    vi.useRealTimers()
+  })
+
+  it('renders section headers for each non-empty section', () => {
+    const wrapper = mountList()
+    const headers = wrapper.findAll('.section-header')
+    expect(headers).toHaveLength(5)
+    expect(headers[0]!.text()).toBe('Today')
+    expect(headers[1]!.text()).toBe('This Week')
+    expect(headers[2]!.text()).toBe('Next Week')
+    expect(headers[3]!.text()).toBe('Later')
+    expect(headers[4]!.text()).toBe('Past')
+  })
+
+  it('renders events within their correct sections', () => {
+    const wrapper = mountList()
+    const sections = wrapper.findAll('.event-section')
+    expect(sections).toHaveLength(5)
+
+    expect(sections[0]!.text()).toContain('Today Event')
+    expect(sections[1]!.text()).toContain('This Week Event')
+    expect(sections[2]!.text()).toContain('Next Week Event')
+    expect(sections[3]!.text()).toContain('Later Event')
+    expect(sections[4]!.text()).toContain('Past Event')
+  })
+
+  it('renders all valid events as cards', () => {
     const wrapper = mountList()
     const cards = wrapper.findAll('.event-card')
-    expect(cards).toHaveLength(3)
-  })
-
-  it('sorts upcoming events before past events', () => {
-    const wrapper = mountList()
-    const titles = wrapper.findAll('.event-card__title').map((el) => el.text())
-    // Upcoming events first (sorted ascending), then past events
-    expect(titles[0]).toBe('Soon Event')
-    expect(titles[1]).toBe('Future Event')
-    expect(titles[2]).toBe('Past Event')
+    expect(cards).toHaveLength(5)
   })
 
   it('marks past events with isPast class', () => {
     const wrapper = mountList()
-    const cards = wrapper.findAll('.event-card')
-    expect(cards).toHaveLength(3)
-    // Last card should be past
-    expect(cards[2]!.classes()).toContain('event-card--past')
-    // First two should not be past
+    const pastSection = wrapper.findAll('.event-section')[4]!
+    const pastCards = pastSection.findAll('.event-card')
+    expect(pastCards).toHaveLength(1)
+    expect(pastCards[0]!.classes()).toContain('event-card--past')
+  })
+
+  it('does not mark non-past events with isPast class', () => {
+    const wrapper = mountList()
+    const todaySection = wrapper.findAll('.event-section')[0]!
+    const cards = todaySection.findAll('.event-card')
     expect(cards[0]!.classes()).not.toContain('event-card--past')
-    expect(cards[1]!.classes()).not.toContain('event-card--past')
+  })
+
+  it('sections have aria-label attributes', () => {
+    const wrapper = mountList()
+    const sections = wrapper.findAll('section')
+    expect(sections[0]!.attributes('aria-label')).toBe('Today')
+    expect(sections[1]!.attributes('aria-label')).toBe('This Week')
+    expect(sections[2]!.attributes('aria-label')).toBe('Next Week')
+    expect(sections[3]!.attributes('aria-label')).toBe('Later')
+    expect(sections[4]!.attributes('aria-label')).toBe('Past')
+  })
+
+  it('does not render date subheader in "Today" section', () => {
+    const wrapper = mountList()
+    const todaySection = wrapper.findAll('.event-section')[0]!
+    expect(todaySection.find('.date-subheader').exists()).toBe(false)
+  })
+
+  it('renders date subheaders in non-today sections', () => {
+    const wrapper = mountList()
+    const thisWeekSection = wrapper.findAll('.event-section')[1]!
+    expect(thisWeekSection.find('.date-subheader').exists()).toBe(true)
+
+    const nextWeekSection = wrapper.findAll('.event-section')[2]!
+    expect(nextWeekSection.find('.date-subheader').exists()).toBe(true)
+
+    const laterSection = wrapper.findAll('.event-section')[3]!
+    expect(laterSection.find('.date-subheader').exists()).toBe(true)
+
+    const pastSection = wrapper.findAll('.event-section')[4]!
+    expect(pastSection.find('.date-subheader').exists()).toBe(true)
   })
 })

frontend/src/components/__tests__/SectionHeader.spec.ts

@@ -0,0 +1,27 @@
+import { describe, it, expect } from 'vitest'
+import { mount } from '@vue/test-utils'
+import SectionHeader from '../SectionHeader.vue'
+
+describe('SectionHeader', () => {
+  it('renders the section label as an h2', () => {
+    const wrapper = mount(SectionHeader, { props: { label: 'Today' } })
+    const h2 = wrapper.find('h2')
+    expect(h2.exists()).toBe(true)
+    expect(h2.text()).toBe('Today')
+  })
+
+  it('does not apply emphasized class by default', () => {
+    const wrapper = mount(SectionHeader, { props: { label: 'Later' } })
+    expect(wrapper.find('.section-header--emphasized').exists()).toBe(false)
+  })
+
+  it('applies emphasized class when emphasized prop is true', () => {
+    const wrapper = mount(SectionHeader, { props: { label: 'Today', emphasized: true } })
+    expect(wrapper.find('.section-header--emphasized').exists()).toBe(true)
+  })
+
+  it('does not apply emphasized class when emphasized prop is false', () => {
+    const wrapper = mount(SectionHeader, { props: { label: 'Past', emphasized: false } })
+    expect(wrapper.find('.section-header--emphasized').exists()).toBe(false)
+  })
+})

frontend/src/components/__tests__/useEventGrouping.spec.ts

@@ -0,0 +1,158 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+import { useEventGrouping } from '../../composables/useEventGrouping'
+import type { StoredEvent } from '../../composables/useEventStorage'
+
+function makeEvent(overrides: Partial<StoredEvent> & { dateTime: string }): StoredEvent {
+  return {
+    eventToken: `evt-${Math.random().toString(36).slice(2, 8)}`,
+    title: 'Test Event',
+    expiryDate: '',
+    ...overrides,
+  }
+}
+
+describe('useEventGrouping', () => {
+  // Fixed "now": Wednesday, 2026-03-11 12:00 local
+  const NOW = new Date(2026, 2, 11, 12, 0, 0)
+
+  beforeEach(() => {
+    vi.useFakeTimers()
+    vi.setSystemTime(NOW)
+  })
+
+  afterEach(() => {
+    vi.useRealTimers()
+  })
+
+  it('returns empty array when no events', () => {
+    const sections = useEventGrouping([], NOW)
+    expect(sections).toEqual([])
+  })
+
+  it('classifies a today event into "today" section', () => {
+    const event = makeEvent({ dateTime: '2026-03-11T18:30:00' })
+    const sections = useEventGrouping([event], NOW)
+    expect(sections).toHaveLength(1)
+    expect(sections[0]!.key).toBe('today')
+    expect(sections[0]!.label).toBe('Today')
+    expect(sections[0]!.dateGroups[0]!.events).toHaveLength(1)
+  })
+
+  it('classifies events into all five sections', () => {
+    const events = [
+      makeEvent({ title: 'Today', dateTime: '2026-03-11T10:00:00' }),
+      makeEvent({ title: 'This Week', dateTime: '2026-03-13T10:00:00' }), // Friday (same week)
+      makeEvent({ title: 'Next Week', dateTime: '2026-03-16T10:00:00' }), // Monday next week
+      makeEvent({ title: 'Later', dateTime: '2026-03-30T10:00:00' }), // far future
+      makeEvent({ title: 'Past', dateTime: '2026-03-09T10:00:00' }), // Monday (past)
+    ]
+    const sections = useEventGrouping(events, NOW)
+    expect(sections).toHaveLength(5)
+    expect(sections[0]!.key).toBe('today')
+    expect(sections[1]!.key).toBe('thisWeek')
+    expect(sections[2]!.key).toBe('nextWeek')
+    expect(sections[3]!.key).toBe('later')
+    expect(sections[4]!.key).toBe('past')
+  })
+
+  it('omits empty sections', () => {
+    const events = [
+      makeEvent({ title: 'Today', dateTime: '2026-03-11T10:00:00' }),
+      makeEvent({ title: 'Past', dateTime: '2026-03-01T10:00:00' }),
+    ]
+    const sections = useEventGrouping(events, NOW)
+    expect(sections).toHaveLength(2)
+    expect(sections[0]!.key).toBe('today')
+    expect(sections[1]!.key).toBe('past')
+  })
+
+  it('sorts upcoming events ascending by time', () => {
+    const events = [
+      makeEvent({ title: 'Later', dateTime: '2026-03-11T20:00:00' }),
+      makeEvent({ title: 'Earlier', dateTime: '2026-03-11T08:00:00' }),
+    ]
+    const sections = useEventGrouping(events, NOW)
+    const todayEvents = sections[0]!.dateGroups[0]!.events
+    expect(todayEvents[0]!.title).toBe('Earlier')
+    expect(todayEvents[1]!.title).toBe('Later')
+  })
+
+  it('sorts past events descending by time (most recent first)', () => {
+    const events = [
+      makeEvent({ title: 'Older', dateTime: '2026-03-01T10:00:00' }),
+      makeEvent({ title: 'Newer', dateTime: '2026-03-09T10:00:00' }),
+    ]
+    const sections = useEventGrouping(events, NOW)
+    const pastEvents = sections[0]!.dateGroups
+    expect(pastEvents[0]!.events[0]!.title).toBe('Newer')
+    expect(pastEvents[1]!.events[0]!.title).toBe('Older')
+  })
+
+  it('groups events by date within a section', () => {
+    const events = [
+      makeEvent({ title: 'Fri AM', dateTime: '2026-03-13T09:00:00' }),
+      makeEvent({ title: 'Fri PM', dateTime: '2026-03-13T18:00:00' }),
+      makeEvent({ title: 'Sat', dateTime: '2026-03-14T12:00:00' }),
+    ]
+    const sections = useEventGrouping(events, NOW)
+    expect(sections[0]!.key).toBe('thisWeek')
+    const dateGroups = sections[0]!.dateGroups
+    expect(dateGroups).toHaveLength(2) // Friday and Saturday
+    expect(dateGroups[0]!.events).toHaveLength(2) // Two Friday events
+    expect(dateGroups[1]!.events).toHaveLength(1) // One Saturday event
+  })
+
+  it('sets showSubheader=false for "today" section', () => {
+    const event = makeEvent({ dateTime: '2026-03-11T18:00:00' })
+    const sections = useEventGrouping([event], NOW)
+    expect(sections[0]!.dateGroups[0]!.showSubheader).toBe(false)
+  })
+
+  it('sets showSubheader=true for non-today sections', () => {
+    const events = [
+      makeEvent({ dateTime: '2026-03-13T10:00:00' }), // thisWeek
+      makeEvent({ dateTime: '2026-03-30T10:00:00' }), // later (beyond next week)
+      makeEvent({ dateTime: '2026-03-01T10:00:00' }), // past
+    ]
+    const sections = useEventGrouping(events, NOW)
+    for (const section of sections) {
+      for (const group of section.dateGroups) {
+        expect(group.showSubheader).toBe(true)
+      }
+    }
+  })
+
+  it('sets emphasized=true only for "today" section', () => {
+    const events = [
+      makeEvent({ dateTime: '2026-03-11T18:00:00' }),
+      makeEvent({ dateTime: '2026-03-30T10:00:00' }),
+    ]
+    const sections = useEventGrouping(events, NOW)
+    expect(sections[0]!.emphasized).toBe(true) // today
+    expect(sections[1]!.emphasized).toBe(false) // later
+  })
+
+  it('on Sunday, tomorrow (Monday) goes to "nextWeek" not "thisWeek"', () => {
+    // Sunday 2026-03-15
+    const sunday = new Date(2026, 2, 15, 12, 0, 0)
+    const mondayEvent = makeEvent({ title: 'Monday', dateTime: '2026-03-16T10:00:00' })
+    const sections = useEventGrouping([mondayEvent], sunday)
+    expect(sections).toHaveLength(1)
+    expect(sections[0]!.key).toBe('nextWeek')
+  })
+
+  it('on Sunday, today events still appear under "today"', () => {
+    const sunday = new Date(2026, 2, 15, 12, 0, 0)
+    const todayEvent = makeEvent({ dateTime: '2026-03-15T18:00:00' })
+    const sections = useEventGrouping([todayEvent], sunday)
+    expect(sections[0]!.key).toBe('today')
+  })
+
+  it('dateGroup labels are formatted via Intl', () => {
+    const event = makeEvent({ dateTime: '2026-03-13T10:00:00' }) // Friday
+    const sections = useEventGrouping([event], NOW)
+    const label = sections[0]!.dateGroups[0]!.label
+    // The exact format depends on locale, but should contain the day number
+    expect(label).toContain('13')
+  })
+})