Add organizer-only attendee list to event detail view (011)

New GET /events/{token}/attendees endpoint returns attendee names when
a valid organizer token is provided (403 otherwise). The frontend
conditionally renders the list below the attendee count for organizers,
silently degrading for visitors.

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

frontend/src/views/__tests__/EventDetailView.spec.ts

@@ -339,6 +339,42 @@ describe('EventDetailView', () => {
     wrapper.unmount()
   })
 
+  // Attendee list (organizer)
+  it('shows attendee list for organizer', async () => {
+    mockGetOrganizerToken.mockReturnValue('org-token-123')
+    mockLoadedEvent()
+    vi.mocked(api.GET)
+      .mockResolvedValueOnce({
+        data: fullEvent,
+        error: undefined,
+        response: new Response(null, { status: 200 }),
+      } as never)
+      .mockResolvedValueOnce({
+        data: { attendees: [{ name: 'Alice' }, { name: 'Bob' }] },
+        error: undefined,
+        response: new Response(null, { status: 200 }),
+      } as never)
+
+    const wrapper = await mountWithToken()
+    await flushPromises()
+
+    expect(wrapper.find('.attendee-list').exists()).toBe(true)
+    expect(wrapper.text()).toContain('Alice')
+    expect(wrapper.text()).toContain('Bob')
+    expect(wrapper.find('.attendee-list__heading').text()).toBe('2 Attendees')
+    wrapper.unmount()
+  })
+
+  it('does not show attendee list for visitor', async () => {
+    mockLoadedEvent()
+
+    const wrapper = await mountWithToken()
+    await flushPromises()
+
+    expect(wrapper.find('.attendee-list').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
   it('shows error when RSVP submission fails', async () => {
     mockLoadedEvent()
     vi.mocked(api.POST).mockResolvedValue({