Add React automatic runtime to SWC config to match Babel

Match the Babel configuration's React automatic runtime setting,
which enables the new JSX transform (no need to import React).

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

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

Author: justin808

config/swc.config.js

@@ -7,6 +7,8 @@ const customConfig = {
       keepClassNames: true,
       transform: {
         react: {
+          // Use automatic runtime (React 17+) - no need to import React
+          runtime: 'automatic',
           // Enable React Fast Refresh in development
           refresh: env.isDevelopment && env.runningWebpackDevServer,
         },