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/tsconfig.json

@@ -20,7 +20,8 @@
     ],
     "paths": {
       "@/*": ["./src/*"]
-    }
+    },
+    "types": ["node", "jest", "@testing-library/jest-dom"]
   },
   "include": [
     "next-env.d.ts",