Replace Three.js globe with Cesium

Migrate the globe view to a Cesium viewer with Esri satellite
imagery and terrain, dropping the custom blue-marble texture and
dot-bead rendering. Add vite-plugin-cesium and a container element
for the viewer.

Also rework the binder leather and suede materials with dedicated
normal maps, and refine timeline labels and page hole sizing.

vite.config.js

@@ -0,0 +1,6 @@
+import { defineConfig } from 'vite';
+import cesium from 'vite-plugin-cesium';
+
+export default defineConfig({
+  plugins: [cesium()],
+});