Add type parameters to vi.fn() mocks for oxlint 1.60 vitest rule

oxlint 1.60 enables vitest/require-mock-type-parameters by default,
which requires explicit type parameters on all vi.fn() calls.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -3,19 +3,20 @@ import { mount, flushPromises } from '@vue/test-utils'
 import { createRouter, createMemoryHistory } from 'vue-router'
 import EventCreateView from '../EventCreateView.vue'
 import { api } from '@/api/client'
+import type { StoredEvent } from '@/composables/useEventStorage'
 vi.mock('@/api/client', () => ({
   api: {
-    POST: vi.fn(),
+    POST: vi.fn<typeof api.POST>(),
   },
 }))
 
 vi.mock('@/composables/useEventStorage', () => ({
-  useEventStorage: vi.fn(() => ({
-    saveCreatedEvent: vi.fn(),
-    getStoredEvents: vi.fn(() => []),
-    getOrganizerToken: vi.fn(),
-    saveRsvp: vi.fn(),
-    getRsvp: vi.fn(),
+  useEventStorage: vi.fn<() => unknown>(() => ({
+    saveCreatedEvent: vi.fn<() => void>(),
+    getStoredEvents: vi.fn<() => unknown[]>(() => []),
+    getOrganizerToken: vi.fn<() => string | undefined>(),
+    saveRsvp: vi.fn<() => void>(),
+    getRsvp: vi.fn<() => unknown>(),
   })),
 }))
 
@@ -154,19 +155,19 @@ describe('EventCreateView', () => {
   })
 
   it('submits successfully, saves to storage, and navigates to event page', async () => {
-    const mockSave = vi.fn()
+    const mockSave = vi.fn<(...args: unknown[]) => void>()
     vi.mocked(vi.importActual<typeof import('@/composables/useEventStorage')>)
     const { useEventStorage } = await import('@/composables/useEventStorage')
     vi.mocked(useEventStorage).mockReturnValue({
       saveCreatedEvent: mockSave,
-      getStoredEvents: vi.fn(() => []),
-      getOrganizerToken: vi.fn(),
-      saveRsvp: vi.fn(),
-      getRsvp: vi.fn(),
-      removeRsvp: vi.fn(),
-      saveWatch: vi.fn(),
-      isStored: vi.fn(() => false),
-      removeEvent: vi.fn(),
+      getStoredEvents: vi.fn<() => StoredEvent[]>(() => []),
+      getOrganizerToken: vi.fn<() => string | undefined>(),
+      saveRsvp: vi.fn<() => void>(),
+      getRsvp: vi.fn<() => { rsvpToken: string; rsvpName: string } | undefined>(),
+      removeRsvp: vi.fn<() => void>(),
+      saveWatch: vi.fn<() => void>(),
+      isStored: vi.fn<() => boolean>(() => false),
+      removeEvent: vi.fn<() => void>(),
     })
 
     vi.mocked(api.POST).mockResolvedValueOnce({