Remove unused Attack button - attack happens automatically on target click

public/game.js

@@ -2,7 +2,7 @@
  * Hexo Game UI - Canvas Rendering and Interactions
  */
 
-import { HexMap, CELL_TYPES } from '../src/map.js';
+import { HexMap, CELL_TYPES } from './map.js';
 
 // Game constants
 const HEX_SIZE = 18;
@@ -107,10 +107,9 @@ class GameUI {
   setupEventListeners() {
     this.canvas.addEventListener('click', (e) => this.handleClick(e));
     this.canvas.addEventListener('mousemove', (e) => this.handleMouseMove(e));
-    
+
     document.getElementById('end-turn-btn').addEventListener('click', () => this.endTurn());
     document.getElementById('new-game-btn').addEventListener('click', () => this.newGame());
-    document.getElementById('attack-btn').addEventListener('click', () => this.executeAttack());
     document.getElementById('cancel-btn').addEventListener('click', () => this.cancelSelection());
   }
 
@@ -524,11 +523,9 @@ class GameUI {
     }
     
     // Update buttons
-    const attackBtn = document.getElementById('attack-btn');
     const cancelBtn = document.getElementById('cancel-btn');
     const endTurnBtn = document.getElementById('end-turn-btn');
-    
-    attackBtn.disabled = !this.selectedCell;
+
     cancelBtn.disabled = !this.selectedCell;
     endTurnBtn.disabled = !this.hasMoved;
   }