Enhance pawn movement logic to allow attackers to get another turn when beating opponent pawns; refactor beatPawns method to return count of beaten pawns

backend/models/room.js

@@ -49,16 +49,20 @@ const RoomSchema = new mongoose.Schema({
 RoomSchema.methods.beatPawns = function (position, attackingPawnColor) {
     // Do not beat pawns on safe/colored positions
     if (isSafePosition(position)) {
-        return;
+        return 0;
     }
-    
+    let beatenCount = 0;
     const pawnsOnPosition = this.pawns.filter(pawn => pawn.position === position);
     pawnsOnPosition.forEach(pawn => {
         if (pawn.color !== attackingPawnColor) {
             const index = this.getPawnIndex(pawn._id);
-            this.pawns[index].position = this.pawns[index].basePos;
+            if (index !== -1 && this.pawns[index].position !== this.pawns[index].basePos) {
+                this.pawns[index].position = this.pawns[index].basePos;
+                beatenCount++;
+            }
         }
     });
+    return beatenCount;
 };
 
 RoomSchema.methods.changeMovingPlayer = function () {