fix: remove CSS conflicts preventing iOS video from extending under notch

- Removed incorrect height calculation that added safe areas to video height
- Removed conflicting absolute positioning from main.css
- Video container now properly uses fixed positioning on mobile
- Desktop layout preserved with absolute positioning

The video now correctly extends edge-to-edge under the iOS notch/Dynamic Island

apps/website/assets/css/voyage-layout.css

@@ -425,11 +425,7 @@ html {
 
 .hero-video-container {
     position: absolute;
-    /* Simple positioning - fill entire parent container */
-    top: 0;
-    left: 0;
-    right: 0;
-    bottom: 0;
+    inset: 0;
     width: 100%;
     height: 100%;
     overflow: hidden;