Enable source maps for production builds (#366)

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: gschier

src-web/vite.config.ts

@@ -39,6 +39,7 @@ export default defineConfig(async () => {
     }),
   ],
   build: {
+    sourcemap: true,
     outDir: '../dist',
     emptyOutDir: true,
     rollupOptions: {