Feat/frontend tests (#62)

* test(frontend): add vitest test infrastructure

- Add vitest, testing-library, jsdom dependencies
- Configure vitest with jsdom environment
- Add test setup with mocks for fetch, localStorage, matchMedia
- Set 75% coverage threshold

* Add frontend tests (#61)

* Initial plan

* Add frontend tests - utilities, hooks, and components (21% coverage)

Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

* Add more component tests (Auth, AboutModal, ExportModal) and useRefill hook tests - 30% coverage

Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

* Add useMedicationForm utility function tests - 30% coverage

Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

* Add AppHeader tests and more schedule.ts tests - 32% coverage

Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

* Changes before error encountered

Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

* Fix page tests and add more tests - 326 tests passing, 34% coverage

Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

* Add tests for ProfileModal, UserFilterModal, MedDetailModal - 361 tests, 36% coverage

Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

* Add SharedSchedule tests - 366 tests, 39% coverage

Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

* Expand page tests - 383 tests, 39% coverage

Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

* Add MobileEditModal tests - 409 tests, 40% coverage

Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

* Expand Dashboard and Schedule page tests - 427 tests, 40% coverage

Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

* Fix code review issues - remove invalid remindEnabled property

Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

---------

Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>
Co-authored-by: DanielVolz <3275994+DanielVolz@users.noreply.github.com>

frontend/package.json

@@ -7,7 +7,9 @@
     "dev": "vite",
     "build": "vite build",
     "preview": "vite preview",
-    "lint": "echo 'add lint config'"
+    "lint": "echo 'add lint config'",
+    "test": "vitest",
+    "test:coverage": "vitest run --coverage"
   },
   "dependencies": {
     "i18next": "^24.2.2",
@@ -19,11 +21,17 @@
     "zod": "^3.23.8"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
+    "@testing-library/user-event": "^14.6.1",
     "@types/react": "^18.3.4",
     "@types/react-dom": "^18.3.0",
     "@types/react-router-dom": "^5.3.3",
     "@vitejs/plugin-react": "^4.3.2",
+    "@vitest/coverage-v8": "^4.0.17",
+    "jsdom": "^27.4.0",
     "typescript": "^5.5.4",
-    "vite": "^7.3.0"
+    "vite": "^7.3.0",
+    "vitest": "^4.0.17"
   }
 }