feat(02-05): EventDetailPopover read-only popover, XSS-safe, wired into CalendarShell

- EventDetailPopover: reads openEventId from Zustand, resolves occurrence from TanStack Query cache
- Dual-mode: standalone (Zustand-driven) + customComponents.eventModal (Schedule-X)
- Plain-text JSX children for all event fields (T-02e-01 XSS guard)
- Focus trap, Escape to close, backdrop-click to close, aria-label=Close (44px target)
- Phone: bottom sheet layout; tablet/desktop: centered popover (max-width 360px)
- Phase-3 footer action area reserved with comment
- CalendarShell: passes customComponents.eventModal=EventDetailPopover to ScheduleXCalendar
- test-setup.ts: import @testing-library/jest-dom for toHaveTextContent matcher
- All 36 tests pass, tsc clean

apps/pwa/src/components/EventDetailPopover.test.tsx

@@ -31,7 +31,9 @@ vi.mock('../store/calendarStore.js', () => ({
 
 // ── Fixtures ───────────────────────────────────────────────────────────────────
 
-const TIMED_OCCURRENCE = {
+import type { CalendarOccurrence } from '../api/client.js'
+
+const TIMED_OCCURRENCE: CalendarOccurrence = {
   id: 'test-uid::2026-06-15T10:00:00',
   uid: 'test-uid',
   calendarId: 1,
@@ -47,7 +49,7 @@ const TIMED_OCCURRENCE = {
   description: 'Daily team sync meeting',
 }
 
-const OCCURRENCE_WITH_HTML = {
+const OCCURRENCE_WITH_HTML: CalendarOccurrence = {
   ...TIMED_OCCURRENCE,
   id: 'xss-uid::2026-06-15T10:00:00',
   uid: 'xss-uid',
@@ -56,7 +58,7 @@ const OCCURRENCE_WITH_HTML = {
   location: '<img src=x onerror=alert(1)>Room',
 }
 
-const ALLDAY_OCCURRENCE = {
+const ALLDAY_OCCURRENCE: CalendarOccurrence = {
   id: 'allday-uid::2026-06-20',
   uid: 'allday-uid',
   calendarId: 2,
@@ -81,7 +83,7 @@ import { useCalendarStore } from '../store/calendarStore.js'
 
 function renderPopover(occurrence = TIMED_OCCURRENCE) {
   mockOpenEventId = occurrence.id
-  ;(useCalendarStore as ReturnType<typeof vi.fn>).mockImplementation(() => ({
+  ;(useCalendarStore as unknown as ReturnType<typeof vi.fn>).mockImplementation(() => ({
     openEventId: mockOpenEventId,
     setOpenEventId: mockSetOpenEventId,
   }))
@@ -157,7 +159,7 @@ describe('EventDetailPopover', () => {
 
   it('renders nothing when openEventId is null', () => {
     mockOpenEventId = null
-    ;(useCalendarStore as ReturnType<typeof vi.fn>).mockImplementation(() => ({
+    ;(useCalendarStore as unknown as ReturnType<typeof vi.fn>).mockImplementation(() => ({
       openEventId: null,
       setOpenEventId: mockSetOpenEventId,
     }))