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/package.json

@@ -81,6 +81,7 @@
     "@iconify/utils": "2.3.0",
     "@iconify/vue": "4.1.2",
     "@intlify/unplugin-vue-i18n": "11.0.1",
+    "@pinia/testing": "^1.0.3",
     "@stylistic/eslint-plugin-js": "0.0.4",
     "@stylistic/eslint-plugin-ts": "0.0.4",
     "@stylistic/stylelint-config": "1.0.1",
@@ -101,6 +102,7 @@
     "@vitejs/plugin-vue": "6.0.1",
     "@vitejs/plugin-vue-jsx": "5.1.1",
     "@vue/test-utils": "^2.4.9",
+    "axe-core": "^4.11.4",
     "baseline-browser-mapping": "^2.10.16",
     "eslint": "8.57.1",
     "eslint-config-airbnb-base": "15.0.0",
@@ -127,6 +129,7 @@
     "eslint-plugin-vue": "9.33.0",
     "eslint-plugin-yml": "1.19.0",
     "happy-dom": "^20.9.0",
+    "jsdom": "^29.1.1",
     "msw": "2.6.8",
     "postcss-html": "1.8.0",
     "postcss-scss": "4.0.9",
@@ -148,6 +151,7 @@
     "vite-plugin-vuetify": "2.1.2",
     "vite-svg-loader": "5.1.0",
     "vitest": "^4.1.5",
+    "vitest-axe": "^0.1.0",
     "vue-eslint-parser": "9.4.3",
     "vue-shepherd": "3.0.0",
     "vue-tsc": "3.1.2"