fix: keep the 2D exit plate on window hover at the destination

src/scene/world/sign-stage.ts

@@ -85,6 +85,12 @@ export function createSignStage(resources: SceneResourceBag) {
       panel.style.setProperty('--chapter-heading-offset', offset);
   };
 
+  let world: Element | null = null;
+  const arrivedAtDestination = () => {
+    world ??= document.querySelector('.journey-world');
+    return world?.getAttribute('data-arrived') === 'true';
+  };
+
   const update = (width: number, height: number) => {
     if (dirty || width !== viewportWidth || height !== viewportHeight) {
       dirty = false;
@@ -100,7 +106,9 @@ export function createSignStage(resources: SceneResourceBag) {
           const rect = windowElement.getBoundingClientRect();
           tilt.x = Math.max(-1, Math.min(1, ((event.clientX - rect.left) / rect.width) * 2 - 1));
           tilt.y = Math.max(-1, Math.min(1, ((event.clientY - rect.top) / rect.height) * 2 - 1));
-          if (event.pointerType === 'mouse') tilt.hover = true;
+          // At the destination the engine is off and the twin would render
+          // dark, so the window keeps its 2D plate (gantry.css agrees).
+          if (event.pointerType === 'mouse') tilt.hover = !arrivedAtDestination();
         }, { passive: true });
         resources.listen(windowElement, 'pointerleave', () => {
           tilt.x = 0;

src/styles/gantry.css

@@ -467,7 +467,8 @@ html[data-gantry='incoming'] .journey-hud {
   transform: translateY(-6px);
 }
 @media (hover: hover) {
-  html[data-gantry]:has(.gantry-window:hover) .journey-hud { opacity: 0; }
+  /* Not at the destination: the engine is off there and the twin is dark. */
+  html[data-gantry]:not(:has(.journey-world[data-arrived='true'])):has(.gantry-window:hover) .journey-hud { opacity: 0; }
 }
 @media (max-width: 767px) {
   html .journey-hud {