Implement enhanced SpawnerMenuFormUI with layout sync and new features

Co-authored-by: ptthanh02 <73684260+ptthanh02@users.noreply.github.com>

Author: Copilot

core/src/main/java/github/nighter/smartspawner/SmartSpawner.java

@@ -433,4 +433,16 @@ public void debug(String message) {
     public SpawnerMenuFormUI getSpawnerMenuFormUI() {
         return spawnerMenuFormUI;
     }
+
+    public SpawnerMenuAction getSpawnerMenuAction() {
+        return spawnerMenuAction;
+    }
+
+    public SpawnerStackerUI getSpawnerStackerUI() {
+        return spawnerStackerUI;
+    }
+
+    public SpawnerSellManager getSpawnerSellManager() {
+        return spawnerSellManager;
+    }
 }

core/src/main/java/github/nighter/smartspawner/spawner/gui/main/SpawnerMenuAction.java

@@ -161,6 +161,18 @@ private boolean handleLayoutAction(Player player, SpawnerData spawner, int slot,
                 handleExpBottleClick(player, spawner, true);
                 handleSellAllItems(player, spawner);
                 return true;
+            case "sell_all":
+                if (isClickTooFrequent(player)) {
+                    return true;
+                }
+                // Check permissions for selling
+                if (!plugin.hasSellIntegration() || !player.hasPermission("smartspawner.sellall")) {
+                    messageService.sendMessage(player, "no_permission");
+                    return true;
+                }
+                // Sell all items only (no XP collection)
+                handleSellAllItems(player, spawner);
+                return true;
             case "collect_exp":
                 handleExpBottleClick(player, spawner, false);
                 return true;