feat: Add Jest testing infrastructure with comprehensive mocks and test scripts

- Add jest.config.js with Next.js integration, jsdom environment, module path mapping, and coverage collection for src/**/*.{js,jsx,ts,tsx}
- Add jest.setup.js with @testing-library/jest-dom, Next.js router/navigation mocks, IntersectionObserver/ResizeObserver/WebSocket/fetch mocks, localStorage/sessionStorage mocks
- Add package.json test scripts: test, test:watch, test:coverage
- Add testing dependencies: @testing-library/jest

apps/web-dashboard/package.json

@@ -6,7 +6,10 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:coverage": "jest --coverage"
   },
   "dependencies": {
     "class-variance-authority": "^0.7.1",
@@ -25,8 +28,14 @@
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",
+    "@testing-library/jest-dom": "^6.4.2",
+    "@testing-library/react": "^14.2.1",
+    "@testing-library/user-event": "^14.5.2",
+    "@types/jest": "^29.5.12",
     "eslint": "^9",
     "eslint-config-next": "16.2.2",
+    "jest": "^29.7.0",
+    "jest-environment-jsdom": "^29.7.0",
     "tailwindcss": "^4",
     "typescript": "^5"
   }