Use shortened model name in scene explorer

packages/frontend-2/components/viewer/explorer/TreeItem.vue

@@ -183,8 +183,17 @@ const isAtomic = computed(() => props.treeItem.atomic === true)
 const speckleData = props.treeItem?.raw as SpeckleObject
 const rawSpeckleData = props.treeItem?.raw as SpeckleObject
 
+function getNestedModelHeader(name: string): string {
+  const parts = name.split('/')
+  return parts.length > 1 ? (parts.pop() as string) : name
+}
+
 const headerAndSubheader = computed(() => {
-  return getHeaderAndSubheaderForSpeckleObject(rawSpeckleData)
+  const { header, subheader } = getHeaderAndSubheaderForSpeckleObject(rawSpeckleData)
+  return {
+    header: getNestedModelHeader(header),
+    subheader
+  }
 })
 
 const childrenLength = computed(() => {