✨ Add ref for virtual scroller in GamemasterExplorer component

code/websites/pokedex.online/src/views/GamemasterExplorer.vue

@@ -354,6 +354,7 @@ const selectedFile = ref('');
 const fileContent = ref('');
 const fileLines = ref([]);
 const displayLines = ref([]);
+const virtualScroller = ref(null); // Ref for the virtual scroller
 
 // UI state
 const showHelp = ref(false);