Reapply "Sit the weapon rack on the bottom edge"

This reverts commit 22d1bf5443.

render.js

@@ -463,7 +463,8 @@ function drawMgRacket() { // horde: the player braces the racket forward and up-
 // the courtside weapon rack along the bottom: PLAIN + the four tins. Tap a tile (or 1–5) to
 // pick which one your next serve throws; empty tins dim out. Geometry is shared with input
 // via rackHit so a tap lands on the tile you see.
-const RACK_BOT = 8;   // px of breathing room below the rack (floats it up off the screen edge)
+const RACK_BOT = 0;   // px below the rack: none — it sits ON the bottom edge. SAFE.bottom still lifts
+                      // it clear of the home indicator, which is the only gap that has to be there.
 const RACK_GRAB = 7;  // px the TOUCH band extends above the drawn rack (below, it runs to the screen edge)
 export const METER_Y = () => H - TUNE.rackH - RACK_BOT - 17 - SAFE.bottom; // the draw meter's fixed bottom slot
 function rackGeom() {