Ads: pin courtside boards to the court's back edge, not a fixed baseline offset

The ad strip sat 12px above the far baseline, but the out-area lawn reaches z=-6, whose projected edge is ~15.5px above the baseline in portrait (camF is larger there) — so the lawn painted over the bottom of the boards. Pinning the strip's bottom to proj(0,0,-6).y clears them in both orientations.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

index.html

@@ -52,6 +52,6 @@
     <p class="start">TAP TO START</p>
   </div>
 </div>
-<script type="module" src="main.js?v=15"></script>
+<script type="module" src="main.js?v=16"></script>
 </body>
 </html>

render.js

@@ -316,8 +316,11 @@ export function render() {
   }
 
   const pal = palette(), pt = paletteT();
-  // stands: the generated crowd, drawn in columns so it can BOUNCE when it cheers
-  const standsBottom = proj(0, 0, 0).y - 12;
+  // stands: the generated crowd, drawn in columns so it can BOUNCE when it cheers.
+  // sit the ad strip flush on the court's back edge (the out-area quad below reaches z=-6);
+  // pinning to that projected line keeps the boards clear of the lawn in BOTH orientations
+  // (a fixed baseline offset over-/under-shoots because camF differs portrait vs landscape).
+  const standsBottom = proj(0, 0, -6).y;
   const adH = 14, crowdH = standsBottom - adH + 2;
   const crowdImg = SPR['x_crowd'];
   if (crowdImg) {