fix(02): show owner name / Family in event popover footer

Backend:
- expand.ts: add ownerName: string | null to CalendarOccurrence
  interface and expandOccurrences() signature; thread it onto every
  emitted occurrence.
- events.ts: SELECT users.displayName as ownerName in the join; pass
  it to expandOccurrences().

Frontend:
- client.ts: add ownerName: string | null to CalendarOccurrence.
- EventDetailPopover.tsx: render isShared ? 'Family' :
  (ownerName ?? calendarName) in the footer instead of calendarName.

Tests:
- expand.test.ts: pass ownerName to all expandOccurrences() calls;
  assert ownerName is carried onto occurrences in the DST test.
- events.test.ts: add ownerName to mock rows; assert ownerName present
  on occurrences; add ownerName assertion to timed-recurring test.
- EventDetailPopover.test.tsx: add ownerName to fixtures; split
  "calendar name in footer" into three targeted tests covering
  personal-with-owner, shared→Family, and null-owner fallback.

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

@@ -39,6 +39,7 @@ const TIMED_OCCURRENCE: CalendarOccurrence = {
   calendarId: 1,
   calendarName: 'My Calendar',
   ownerUserId: 1,
+  ownerName: 'Alice',
   color: '#4A90D9',
   isShared: false,
   title: 'Team Standup',
@@ -64,6 +65,7 @@ const ALLDAY_OCCURRENCE: CalendarOccurrence = {
   calendarId: 2,
   calendarName: 'Shared Calendar',
   ownerUserId: 1,
+  ownerName: 'Alice',
   color: '#F25C7A',
   isShared: true,
   title: 'Birthday Party',
@@ -124,8 +126,25 @@ describe('EventDetailPopover', () => {
     expect(screen.getByText(/Daily team sync meeting/)).toBeDefined()
   })
 
-  it('renders calendar name in footer', () => {
+  it('renders owner name in footer for personal events', () => {
     renderPopover(TIMED_OCCURRENCE)
+    // TIMED_OCCURRENCE is personal (isShared:false) with ownerName:'Alice'
+    expect(screen.getByText(/Alice/)).toBeDefined()
+  })
+
+  it('renders "Family" in footer for shared calendar events', () => {
+    renderPopover(ALLDAY_OCCURRENCE)
+    // ALLDAY_OCCURRENCE has isShared:true — footer must show 'Family'
+    expect(screen.getByText('Family')).toBeDefined()
+  })
+
+  it('renders calendarName in footer when ownerName is null', () => {
+    const noOwnerName: CalendarOccurrence = {
+      ...TIMED_OCCURRENCE,
+      id: 'no-owner-uid::2026-06-15T10:00:00',
+      ownerName: null,
+    }
+    renderPopover(noOwnerName)
     expect(screen.getByText(/My Calendar/)).toBeDefined()
   })