fix: drag & drop folder support — install mod folders directly

mod_manager.py

@@ -952,7 +952,16 @@ class ModManagerWindow(QMainWindow):
     def dropEvent(self, event: QDropEvent):
         for url in event.mimeData().urls():
             filepath = url.toLocalFile()
-            if filepath:
+            if not filepath:
+                continue
+            
+            path = Path(filepath)
+            if path.is_dir():
+                # Dropped a folder — install as mod from folder
+                installed, errors = install_mod_from_folder(path, self.config["game_path"])
+                total = sum(installed.values())
+                self.status.showMessage(f"Installed {total} files from {path.name}")
+            else:
                 self.install_mod(filepath)
     
     # --- Top bar ---