Minor improvements

src/components/zone/Tiles.vue

@@ -11,7 +11,7 @@ import { storeToRefs } from 'pinia'
 import { placeTile, setAllTiles } from '@/composables/zoneComposable'
 import Controls from '@/components/utilities/Controls.vue'
 
-const emit = defineEmits(['tilemap:create'])
+const emit = defineEmits(['tilemap:create', 'tilemap:destroy'])
 
 const zoneStore = useZoneStore()
 const scene = useScene()
@@ -67,7 +67,8 @@ onBeforeMount(() => {
 })
 
 onBeforeUnmount(() => {
-  tiles?.destroy()
+  emit('tilemap:destroy')
+  zoneTilemap.destroyLayer('tiles')
   zoneTilemap.removeAllLayers()
   zoneTilemap.destroy()
 })