fix: FOV rays originate from actual camera position (Y=-1), not court edge

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/web/templates/index.html

@@ -691,10 +691,8 @@ function addStereocameras(scene) {
             return new THREE.Vector3(px, py, 0.015);
         }
 
-        // Camera position projected onto court near edge (Y=0)
-        var camOnCourt = new THREE.Vector3(
-            Math.max(courtMinX, Math.min(courtMaxX, cx)), courtMinY, 0.015
-        );
+        // Camera actual position (behind court at Y=-1)
+        var camOnCourt = new THREE.Vector3(cx, oy, 0.015);
 
         // Far edge points
         var farPoints = [];