Fix ESLint configuration for workspace package imports

- Added import/extensions rule override for packages/react-on-rails/src/**/*
- Allows TypeScript files to use .ts extensions in imports (ignorePackages)
- Resolves 111 ESLint import/extensions violations after workspace migration
- Matches existing node_package/**/* rule configuration

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: AbanoubGhadban

eslint.config.ts

@@ -150,6 +150,12 @@ const config = tsEslint.config([
       'import/extensions': ['error', 'ignorePackages'],
     },
   },
+  {
+    files: ['packages/react-on-rails/src/**/*'],
+    rules: {
+      'import/extensions': ['error', 'ignorePackages'],
+    },
+  },
   {
     files: ['lib/generators/react_on_rails/templates/**/*'],
     rules: {