fix: domino drag-drop touchend fallback + auto-pass when blocked

- Added touchend listener as fallback in DominoDrag for browsers/envs
  where pointerup doesn't fire after touch events
- Added auto-pass (1.5s timeout) when player is blocked and boneyard
  is empty — prevents game from stalling
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/js/modules/domino/components/drag.js

@@ -30,6 +30,7 @@ export class DominoDrag {
     document.addEventListener('pointermove', this._onMove);
     document.addEventListener('pointerup', this._onUp);
     document.addEventListener('pointercancel', this._onUp);
+    document.addEventListener('touchend', this._onUp);
 
     juice.hapticLight?.();
     audio.play('click');
@@ -114,6 +115,7 @@ export class DominoDrag {
     document.removeEventListener('pointermove', this._onMove);
     document.removeEventListener('pointerup', this._onUp);
     document.removeEventListener('pointercancel', this._onUp);
+    document.removeEventListener('touchend', this._onUp);
 
     this.board.clearGhost();
 
@@ -170,5 +172,6 @@ export class DominoDrag {
     document.removeEventListener('pointermove', this._onMove);
     document.removeEventListener('pointerup', this._onUp);
     document.removeEventListener('pointercancel', this._onUp);
+    document.removeEventListener('touchend', this._onUp);
   }
 }

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

@@ -16,6 +16,7 @@ import { DominoDrag } from '../components/drag.js';
 
 let state, board, hand, drag, liveSession;
 let botTimeout = null;
+let autoPassTimeout = null;
 
 export function mountGame(el, params) {
   const { mode = 'bot', matchId, playerIndex = 0, players, botLevel = 'intermediate' } = params;
@@ -867,7 +868,11 @@ function updateUI(el) {
   } else if (isMyTurn && !hasMove && state.boneyard.length === 0 && !state.gameOver) {
     if (drawBtn) drawBtn.style.display = 'none';
     if (passBtn) passBtn.style.display = '';
+    if (!autoPassTimeout) {
+      autoPassTimeout = setTimeout(() => { autoPassTimeout = null; passTurn(el); }, 1500);
+    }
   } else {
+    if (autoPassTimeout) { clearTimeout(autoPassTimeout); autoPassTimeout = null; }
     if (drawBtn) { drawBtn.style.display = ''; drawBtn.style.animation = ''; }
     if (passBtn) passBtn.style.display = 'none';
   }
@@ -934,6 +939,7 @@ async function createServerRecord() {
 
 export function unmountGame() {
   if (botTimeout) { clearTimeout(botTimeout); botTimeout = null; }
+  if (autoPassTimeout) { clearTimeout(autoPassTimeout); autoPassTimeout = null; }
   liveSession?.cleanup?.();
   mp.stopDisconnectWatch?.();
   board?.destroy();