refactor: separate standalone Vite wiring and provider middleware

src/standalone/application.js

@@ -0,0 +1,30 @@
+import { createApplication } from '../app/application.js';
+import { createStandaloneScene } from './scene.js';
+import { createStandaloneControls } from './controls.js';
+import { createStandaloneData } from './data.js';
+import { createStandaloneTools } from './tools.js';
+
+// The existing controls and layer catalog contain page-scoped state.
+let constructed = false;
+
+/** Compose the standalone application once per page. Reload to start again. */
+export function createStandaloneApplication({
+  googleApiKey,
+  cesiumToken,
+  allowQaRegistration = false,
+}) {
+  if (constructed)
+    throw new Error('The standalone application already owns this page');
+  constructed = true;
+  const loadingScreen = document.getElementById('loading-screen');
+  const loaderStatus = loadingScreen.querySelector('.loader-status');
+  return createApplication({
+    createScene: (context) =>
+      createStandaloneScene({ ...context, googleApiKey, cesiumToken, loaderStatus }),
+    createControls: (context) =>
+      createStandaloneControls({ ...context, loaderStatus }),
+    createData: (context) =>
+      createStandaloneData({ ...context, allowQaRegistration }),
+    createTools: (context) => createStandaloneTools({ ...context, loadingScreen }),
+  });
+}