feat(03-05): implement EventForm modal (create/edit)

- Bottom sheet on phone, centered 480px dialog on desktop (EventDetailPopover pattern)
- Fields: title, all-day toggle, start/end date/time, recurrence select, location, description
- D-02: calendar picker hidden when 1 writable calendar, shown when >1 (from writable-calendars endpoint)
- D-11: recurrence presets None/Daily/Weekly/Monthly/Yearly only (whole-series)
- Validation: empty title + end-before-start with UI-SPEC error copy
- create mode: POST /api/events/create; edit mode: PATCH /api/events/:uid/edit
- role=dialog aria-modal=true; focus Title on open; Escape/backdrop close
- T-03-15: all values as plain-text JSX children; no dangerouslySetInnerHTML
- D-01: last-used calendar URL persisted in localStorage
- Auto-fix: vi.hoisted() for mock factory variables (D-03-04-hoisting)

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

@@ -23,9 +23,21 @@ import { render, screen, fireEvent, waitFor } from '@testing-library/react'
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
 
 // ── Module mocks ──────────────────────────────────────────────────────────────
+// vi.hoisted() is required for variables used inside vi.mock() factory functions
+// to avoid TDZ (temporal dead zone) issues — decision D-03-04-hoisting.
+
+const {
+  mockSetEventForm,
+  mockCreateEvent,
+  mockUpdateEvent,
+  mockFetchWritableCalendars,
+} = vi.hoisted(() => ({
+  mockSetEventForm: vi.fn(),
+  mockCreateEvent: vi.fn().mockResolvedValue({ uid: 'new-uid-123' }),
+  mockUpdateEvent: vi.fn().mockResolvedValue({ uid: 'edit-uid-456' }),
+  mockFetchWritableCalendars: vi.fn(),
+}))
 
-// Mock the calendarStore
-const mockSetEventForm = vi.fn()
 let mockEventFormOpen = true
 let mockEventFormMode: 'create' | 'edit' = 'create'
 let mockEventFormUid: string | null = null
@@ -39,11 +51,6 @@ vi.mock('../store/calendarStore.js', () => ({
   })),
 }))
 
-// Mock write client calls
-const mockCreateEvent = vi.fn().mockResolvedValue({ uid: 'new-uid-123' })
-const mockUpdateEvent = vi.fn().mockResolvedValue({ uid: 'edit-uid-456' })
-const mockFetchWritableCalendars = vi.fn()
-
 vi.mock('../api/client.js', () => ({
   createEvent: mockCreateEvent,
   updateEvent: mockUpdateEvent,