Add ESLint and related imports for improved code quality checks

Author: hotlong

apps/playground/package.json

@@ -24,6 +24,7 @@
     "@types/react-dom": "^18.3.1",
     "@vitejs/plugin-react": "^4.2.1",
     "autoprefixer": "^10.4.23",
+    "eslint": "^9.39.1",
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.4.24",
     "globals": "^16.5.0",

apps/playground/test-import.js

@@ -0,0 +1,20 @@
+try {
+  await import('eslint/config');
+  console.log('eslint/config imported successfully');
+} catch (e) {
+  console.error('Failed to import eslint/config:', e.message);
+}
+
+try {
+  await import('eslint-plugin-react-hooks');
+  console.log('eslint-plugin-react-hooks imported successfully');
+} catch (e) {
+  console.error('Failed to import eslint-plugin-react-hooks:', e.message);
+}
+
+try {
+  await import('typescript-eslint');
+  console.log('typescript-eslint imported successfully');
+} catch (e) {
+  console.error('Failed to import typescript-eslint:', e.message);
+}