fix: switch to @vitejs/plugin-react-swc and manual component registration

- Replace @vitejs/plugin-react with @vitejs/plugin-react-swc to fix
  React Refresh preamble detection error in cross-origin Docker setup
- Register React components manually via window.resolveReactComponent
  since ux-react's registerReactControllerComponents uses Webpack's
  require.context API which is incompatible with Vite

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

assets/bootstrap.js

@@ -1,6 +1,19 @@
 import { startStimulusApp } from '@symfony/stimulus-bundle';
-import { registerReactControllerComponents } from '@symfony/ux-react';
 
 const app = startStimulusApp();
 
-registerReactControllerComponents(import.meta.glob('./react/controllers/**/*.jsx', { eager: true }));
+// Register React components for {{ react_component() }} Twig function.
+// We register them manually because @symfony/ux-react's registerReactControllerComponents
+// expects Webpack's require.context API, which is not available in Vite.
+const reactControllers = import.meta.glob('./react/controllers/**/*.jsx', { eager: true });
+
+window.resolveReactComponent = (name) => {
+    const key = `./react/controllers/${name}.jsx`;
+    const module = reactControllers[key];
+    if (!module) {
+        const available = Object.keys(reactControllers)
+            .map(k => k.replace('./react/controllers/', '').replace('.jsx', ''));
+        throw new Error(`React controller "${name}" does not exist. Possible values: ${available.join(', ')}`);
+    }
+    return module.default;
+};