Add ErrorBoundary component with tests and LoadingSpinner

.eslintrc.json

@@ -1,3 +1,3 @@
 {
-  "extends": ["next/babel", "next/core-web-vitals"]
+  "extends": ["next/core-web-vitals"]
 }

jest.config.js

@@ -0,0 +1,28 @@
+const nextJest = require('next/jest');
+
+const createJestConfig = nextJest({
+  // Provide the path to your Next.js app to load next.config.js and .env files in your test environment
+  dir: './',
+});
+
+// Add any custom config to be passed to Jest
+const customJestConfig = {
+  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
+  testEnvironment: 'jest-environment-jsdom',
+  moduleNameMapper: {
+    '^@/(.*)$': '<rootDir>/src/$1',
+  },
+  testMatch: [
+    '<rootDir>/src/__tests__/**/*.test.(js|jsx|ts|tsx)',
+  ],
+  collectCoverage: true,
+  collectCoverageFrom: [
+    'src/**/*.{js,jsx,ts,tsx}',
+    '!src/**/*.d.ts',
+    '!src/**/*.stories.{js,jsx,ts,tsx}',
+    '!src/app/layout.js',
+    '!src/app/page.jsx',
+  ],
+};
+
+module.exports = createJestConfig(customJestConfig);

jest.setup.js

@@ -0,0 +1 @@
+import '@testing-library/jest-dom';