test: add mountWithVuexy helper, install axe-core, segment vitest configs

Foundation for the upcoming component / integration / a11y tests.

vitest.config.ts now declares two projects:
  - "unit"      — pure-logic tests under tests/unit/, src/**/__tests__/,
                  and tests/*.spec.ts (the legacy sanity test).
                  happy-dom, no Vuetify, fast path.
  - "component" — tests under tests/component/, tests/integration/,
                  tests/a11y/. jsdom, Vuetify inlined via SSR noExternal,
                  CSS imports processed (so :root token sheet loads), and
                  no global vue-router mock so the real router can run.

Both share the same alias map and AutoImport bag.

tests/utils/mountWithVuexy.ts (new):
  - Real Vuetify with the Crewli theme tokens
  - createTestingPinia (actions execute by default; stubActions opt-in)
  - vue-router with memory history at the configured initialPath + ?query
  - Fresh QueryClient per call (zero cross-test cache leak)
  - Notification mock injected via Pinia plugin so any useNotificationStore()
    resolves to { show: vi.fn(), hide: vi.fn() } — matches the actual
    NotificationStore API surface (per Phase A finding A4)
  - Imports `@/styles/tokens/_timetable.css` at module load so JSDOM resolves
    var(--tt-…) when components call getComputedStyle()

tests/setup.component.ts (new):
  - vitest-axe matcher registration
  - JSDOM polyfills: scrollIntoView, ResizeObserver, visualViewport, body
    bounding rect — Vuetify menus / overlays would crash without them
  - Deterministic crypto polyfill (mirrors tests/setup.ts so
    generateIdempotencyKey() is stable, but without the router mock)

tests/component/_smoke.test.ts (new):
  - Mounts a trivial component → asserts wrapper, queryClient, pinia,
    router, notificationMock all populated
  - Calls getComputedStyle(documentElement).getPropertyValue('--tt-status-confirmed-bg')
    → asserts '#e8f8f0' (proves the CSS token sheet really loaded)

devDependencies added: jsdom, axe-core, vitest-axe, @pinia/testing.

Total: 319 → 321 tests; 42 → 43 files. Both projects green.

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

apps/app/tests/component/_smoke.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, it } from 'vitest'
+import { defineComponent, h } from 'vue'
+import { mountWithVuexy } from '../utils/mountWithVuexy'
+
+describe('mountWithVuexy harness', () => {
+  it('mounts a trivial component with the full Vuexy stack', () => {
+    const Trivial = defineComponent({
+      setup() {
+        return () => h('div', { 'data-test': 'ok' }, 'hello')
+      },
+    })
+
+    const { wrapper, queryClient, pinia, router, notificationMock } = mountWithVuexy(Trivial)
+
+    expect(wrapper.find('[data-test="ok"]').text()).toBe('hello')
+    expect(queryClient).toBeDefined()
+    expect(pinia).toBeDefined()
+    expect(router).toBeDefined()
+    expect(notificationMock.show).toBeTypeOf('function')
+  })
+
+  it('loads the timetable CSS token sheet so var(--tt-…) resolves on :root', () => {
+    const Probe = defineComponent({
+      setup() {
+        return () => h('div', { id: 'probe' })
+      },
+    })
+
+    mountWithVuexy(Probe)
+
+    // The CSS file is imported at module load time inside mountWithVuexy.
+    // Resolving against documentElement (=:root) avoids ambiguity around
+    // jsdom's default style-cascade behaviour on arbitrary elements.
+    const value = getComputedStyle(document.documentElement).getPropertyValue('--tt-status-confirmed-bg').trim()
+
+    expect(value).toBe('#e8f8f0')
+  })
+})