Initial commit: Complete NodeJS-native setup

- Migrated from Python pre-commit to NodeJS-native solution
- Reorganized documentation structure
- Set up Husky + lint-staged for efficient pre-commit hooks
- Fixed Dockerfile healthcheck issue
- Added comprehensive documentation index

tests/setup.ts

@@ -0,0 +1,39 @@
+// Test setup file
+// Configure jsdom and global test utilities
+
+import 'jest-environment-jsdom';
+
+// Mock localStorage
+const localStorageMock = {
+  getItem: jest.fn(),
+  setItem: jest.fn(),
+  removeItem: jest.fn(),
+  clear: jest.fn(),
+  length: 0,
+  key: jest.fn(),
+} as Storage;
+
+Object.defineProperty(window, 'localStorage', {
+  value: localStorageMock,
+});
+
+// Mock fetch
+global.fetch = jest.fn();
+
+// Setup console to avoid noise in tests
+const originalError = console.error;
+beforeAll(() => {
+  console.error = (...args: any[]) => {
+    if (
+      typeof args[0] === 'string' &&
+      args[0].includes('Warning: ReactDOM.render is deprecated')
+    ) {
+      return;
+    }
+    originalError.call(console, ...args);
+  };
+});
+
+afterAll(() => {
+  console.error = originalError;
+});