Stage WebGL scene loading

public/js/webgl-book-scene-module.js

@@ -10,7 +10,7 @@ const DEFAULT_BOOK_PROGRESS = 0.5;
 class WebGLBookSceneModule extends BaseModule {
     constructor() {
         super('webgl-book-scene', 'WebGL Book Scene');
-        this.dependencies = ['persistence-manager', 'localization'];
+        this.dependencies = ['persistence-manager', 'localization', 'book-texture-renderer'];
         this.persistenceManager = null;
         this.localization = null;
         this.mode = '2d';
@@ -73,6 +73,8 @@ class WebGLBookSceneModule extends BaseModule {
         this.reportProgress(35, 'Creating WebGL host');
         this.ensureShell();
         this.installPreferenceBridge();
+        this.reportProgress(45, 'Loading WebGL scene modules');
+        await this.initializeScene();
 
         this.reportProgress(100, 'WebGL book host ready');
         return true;
@@ -173,7 +175,10 @@ class WebGLBookSceneModule extends BaseModule {
         window.WebGLBookInitialState = {
             appMode: true,
             pageCount,
-            progress
+            progress,
+            reportProgress: (percent, message) => {
+                this.reportProgress(percent, message);
+            }
         };
     }
 
@@ -293,6 +298,10 @@ class WebGLBookSceneModule extends BaseModule {
         const cacheBuster = window.MODULE_CACHE_BUSTER || Date.now();
         this.labImportPromise = import(`/js/webgl-book-lab.js?v=${encodeURIComponent(cacheBuster)}`);
         await this.labImportPromise;
+        this.reportProgress(94, 'Uploading initial book page textures');
+        window.BookTextureRenderer?.publishSpread?.();
+        await new Promise(resolve => requestAnimationFrame(resolve));
+        this.reportProgress(96, 'Binding WebGL page controls');
         this.installTextureEventBridge();
         this.triggerTextureRefresh();
         return this.labImportPromise;
@@ -459,11 +468,7 @@ class WebGLBookSceneModule extends BaseModule {
         if (this.mode === '3d') {
             this.createLabHost();
             this.installPreferenceBridge();
-            this.initializeScene()
-                .then(() => this.triggerTextureRefresh())
-                .catch((error) => {
-                    console.error('WebGLBookScene: Failed to initialize procedural scene', error);
-                });
+            if (this.labImportPromise) this.triggerTextureRefresh();
         }
         const title = document.getElementById('game_title')?.textContent?.trim();
         const label = document.getElementById('lab_title');