fix: inject hand/drag styles after component creation

Styles were injected before hand/drag were instantiated, resulting in
zero-dimension tiles (CSS classes never added to page).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/js/modules/domino/scenes/game.js

@@ -25,7 +25,6 @@ export function mountGame(el, params) {
   dealNewRound();
 
   el.innerHTML = buildLayout(mode);
-  injectStyles(el);
 
   const boardContainer = el.querySelector('#domino-board');
   board = new DominoBoard(boardContainer, {
@@ -46,6 +45,8 @@ export function mountGame(el, params) {
     getEnds: () => ({ leftEnd: state.leftEnd, rightEnd: state.rightEnd })
   });
 
+  injectStyles(el);
+
   updateUI(el);
   refreshHand();