fix: apply review findings; make ops strip text CSS-generated

src/composables/useHeadlight.ts

@@ -1,4 +1,4 @@
-import { onMounted, onUnmounted, type Ref } from 'vue';
+import { onMounted, onUnmounted, watch, type Ref } from 'vue';
 
 const SURFACES = '.project-case-study, .project-card, .contact-destination, .infrastructure-flow-figure';
 
@@ -37,6 +37,12 @@ export function useHeadlight(enabled: Ref<boolean>): void {
     if (frame === 0) frame = requestAnimationFrame(flush);
   };
 
+  watch(enabled, (value) => {
+    if (value) return;
+    active = false;
+    delete document.documentElement.dataset.headlight;
+  });
+
   onMounted(() => {
     if (!window.matchMedia('(pointer: fine)').matches) return;
     window.addEventListener('pointermove', onMove, { passive: true });