Sit the weapon rack on the bottom edge

The 8px of breathing room under it read as padding, not as breathing room.
SAFE.bottom still lifts the rack clear of the home indicator — that gap is
the one that has to be there. The desktop key hint lived in the band that
just disappeared, so it moves to the empty top-right corner.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

index.html

@@ -46,7 +46,8 @@
            width: calc(100vw - env(safe-area-inset-left, 0px) - env(safe-area-inset-right, 0px));
            height: calc(100vh - env(safe-area-inset-top, 0px));
            height: calc(100dvh - env(safe-area-inset-top, 0px)); }
-  #hint { position: fixed; bottom: 8px; width: 100%; text-align: center;
+  /* desktop key hint — up in the empty top-right corner now that the rack owns the bottom edge */
+  #hint { position: fixed; top: 6px; right: 10px; text-align: right;
           font: 400 10px Silkscreen, monospace; color: #6b7688; }
   @media (pointer: coarse) { #hint, #intro .kb { display: none; } }
   #intro { position: fixed; inset: 0; z-index: 10; touch-action: none; display: grid; place-items: center;