Add shader page reveal checkpoint

public/js/book-page-format-module.js

@@ -3,7 +3,7 @@
  * Defines the canonical page geometry used by the WebGL book renderer.
  */
 import { BaseModule } from './base-module.js';
-import { calculateProceduralBookThickness, snapProceduralPageCount } from './procedural-book-model.js?v=20260607-webgl-paper-loader-fix';
+import { calculateProceduralBookThickness, snapProceduralPageCount } from './procedural-book-model.js?v=20260607-webgl-shader-reveal';
 
 export const BOOK_TEXTURE_WIDTH = 3072;
 
@@ -20,13 +20,13 @@ class BookPageFormatModule extends BaseModule {
             margins: Object.freeze({
                 topIn: 0.46,
                 bottomIn: 0.58,
-                innerBaseIn: 0.375,
-                innerMinIn: 0.44,
-                innerMaxIn: 0.68,
-                innerThicknessFactor: 0.25,
-                outerBaseIn: 0.44,
-                outerThicknessFactor: 0.04,
-                outerMaxIn: 0.5
+                innerBaseIn: 0.42,
+                innerMinIn: 0.48,
+                innerMaxIn: 0.74,
+                innerThicknessFactor: 0.32,
+                outerBaseIn: 0.36,
+                outerThicknessFactor: 0.02,
+                outerMaxIn: 0.42
             }),
             typography: Object.freeze({
                 fontFamily: '"EB Garamond", "EB Garamond 12", serif',