Add swc-loader to React on Rails generator dependencies

The generators were missing swc-loader and @swc/core in the dev dependencies,
causing CI failures when generating example apps with Shakapacker 9.3.0.

This commit adds both packages to the dev_deps list in:
- lib/generators/react_on_rails/base_generator.rb
- lib/generators/react_on_rails/install_generator.rb

Also fixes ESLint warnings in webpack config for CSS modules configuration.

This ensures that all generated apps have the required SWC dependencies
for Shakapacker 9.3.0's default JavaScript transpiler.

Fixes CI failures in:
- examples (3.2, minimum)
- examples (3.4, latest)
- build-dummy-app-webpack-test-bundles tests

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

Co-Authored-By: Claude <noreply@anthropic.com>

Author: justin808

lib/generators/react_on_rails/base_generator.rb

@@ -201,6 +201,8 @@ def add_dev_dependencies
         dev_deps = %w[
           @pmmmwh/react-refresh-webpack-plugin
           react-refresh
+          @swc/core
+          swc-loader
         ]
         return if add_npm_dependencies(dev_deps, dev: true)
 

lib/generators/react_on_rails/install_generator.rb

@@ -494,6 +494,8 @@ def add_dev_dependencies
         dev_deps = %w[
           @pmmmwh/react-refresh-webpack-plugin
           react-refresh
+          @swc/core
+          swc-loader
         ]
         if add_npm_dependencies(dev_deps, dev: true)
           @added_dependencies_to_package_json = true

spec/dummy/config/webpack/commonWebpackConfig.js

@@ -33,7 +33,9 @@ baseClientWebpackConfig.module.rules.forEach((rule) => {
   if (Array.isArray(rule.use)) {
     rule.use.forEach((loader) => {
       if (loader.loader && loader.loader.includes('css-loader') && loader.options?.modules) {
+        // eslint-disable-next-line no-param-reassign
         loader.options.modules.namedExport = false;
+        // eslint-disable-next-line no-param-reassign
         loader.options.modules.exportLocalsConvention = 'camelCase';
       }
     });