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/jest.setup.js

@@ -0,0 +1,92 @@
+import '@testing-library/jest-dom'
+
+// Mock Next.js router
+jest.mock('next/router', () => ({
+  useRouter() {
+    return {
+      route: '/',
+      pathname: '/',
+      query: '',
+      asPath: '',
+      push: jest.fn(),
+      pop: jest.fn(),
+      reload: jest.fn(),
+      back: jest.fn(),
+      prefetch: jest.fn().mockResolvedValue(undefined),
+      beforePopState: jest.fn(),
+      events: {
+        on: jest.fn(),
+        off: jest.fn(),
+        emit: jest.fn(),
+      },
+    }
+  },
+}))
+
+// Mock Next.js navigation
+jest.mock('next/navigation', () => ({
+  useRouter() {
+    return {
+      push: jest.fn(),
+      replace: jest.fn(),
+      prefetch: jest.fn(),
+      back: jest.fn(),
+      forward: jest.fn(),
+      refresh: jest.fn(),
+    }
+  },
+  useSearchParams() {
+    return new URLSearchParams()
+  },
+  usePathname() {
+    return '/'
+  },
+}))
+
+// Mock IntersectionObserver
+global.IntersectionObserver = jest.fn().mockImplementation(() => ({
+  observe: jest.fn(),
+  unobserve: jest.fn(),
+  disconnect: jest.fn(),
+}))
+
+// Mock ResizeObserver
+global.ResizeObserver = jest.fn().mockImplementation(() => ({
+  observe: jest.fn(),
+  unobserve: jest.fn(),
+  disconnect: jest.fn(),
+}))
+
+// Mock WebSocket
+global.WebSocket = jest.fn().mockImplementation(() => ({
+  addEventListener: jest.fn(),
+  removeEventListener: jest.fn(),
+  send: jest.fn(),
+  close: jest.fn(),
+  readyState: 1,
+  CONNECTING: 0,
+  OPEN: 1,
+  CLOSING: 2,
+  CLOSED: 3,
+}))
+
+// Mock fetch
+global.fetch = jest.fn()
+
+// Mock localStorage
+const localStorageMock = {
+  getItem: jest.fn(),
+  setItem: jest.fn(),
+  removeItem: jest.fn(),
+  clear: jest.fn(),
+}
+global.localStorage = localStorageMock
+
+// Mock sessionStorage
+const sessionStorageMock = {
+  getItem: jest.fn(),
+  setItem: jest.fn(),
+  removeItem: jest.fn(),
+  clear: jest.fn(),
+}
+global.sessionStorage = sessionStorageMock