Feature: Map size configuration

public/index.html

@@ -26,6 +26,16 @@
             </select>
           </div>
 
+          <div class="setup-group">
+            <label for="map-size">Map Size:</label>
+            <select id="map-size">
+              <option value="10">Small (10x10)</option>
+              <option value="15">Medium (15x15)</option>
+              <option value="20" selected>Large (20x20)</option>
+              <option value="25">Extra Large (25x25)</option>
+            </select>
+          </div>
+
           <div class="setup-group">
             <label>Player Types:</label>
             <div id="player-types">
@@ -91,6 +101,10 @@
               <span>Phase:</span>
               <span id="game-phase">Movement</span>
             </div>
+            <div class="info-item">
+              <span>Map Size:</span>
+              <span id="map-size-display">20x20</span>
+            </div>
           </div>
 
           <button class="btn btn-primary" id="end-turn-btn">End Turn</button>