feat(ci): add CI/CD pipeline configuration and tests

jest.setup.js

@@ -0,0 +1,33 @@
+import '@testing-library/jest-dom';
+
+// Optional: configure or set up a testing framework before each test
+// If you delete this file, remove `setupFilesAfterEnv` from `jest.config.js`
+
+// Global test utilities can be added here
+global.ResizeObserver = jest.fn().mockImplementation(() => ({
+  observe: jest.fn(),
+  unobserve: jest.fn(),
+  disconnect: jest.fn(),
+}));
+
+// Mock IntersectionObserver
+global.IntersectionObserver = jest.fn().mockImplementation(() => ({
+  observe: jest.fn(),
+  unobserve: jest.fn(),
+  disconnect: jest.fn(),
+}));
+
+// Mock matchMedia
+Object.defineProperty(window, 'matchMedia', {
+  writable: true,
+  value: jest.fn().mockImplementation((query) => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: jest.fn(), // deprecated
+    removeListener: jest.fn(), // deprecated
+    addEventListener: jest.fn(),
+    removeEventListener: jest.fn(),
+    dispatchEvent: jest.fn(),
+  })),
+});