fix: createNewGroupAndMove should rename trace profiles, not create identity

Changed from apiCall('create_identity_from_face') to updateTraceProfileGroup(name).
This correctly creates a new face group by renaming trace_profiles.name
instead of trying to register a global identity.

src/views/PeopleView.vue

@@ -1864,24 +1864,34 @@ async function createNewGroupAndMove() {
     traceList.push({ file_uuid, trace_id: parseInt(trace_id) })
   }
   
-  const firstTrace = traceList[0]
-  if (!firstTrace) return
+  if (!traceList.length) return
   
-  try {
-    const result: any = await apiCall('create_identity_from_face', { 
-      fileUuid: firstTrace.file_uuid, 
-      name, 
-      traceIds: traceList.map(t => t.trace_id)
-    })
-    
-    if (result?.group_uuid) {
-      clearSelection()
-      await refresh()
-    }
-  } catch (e) {
-    console.error('Create new group failed:', e)
-    alert('Failed to create new group')
+  // Group by file_uuid for batch update
+  const byFile: Record<string, number[]> = {}
+  for (const t of traceList) {
+    if (!byFile[t.file_uuid]) byFile[t.file_uuid] = []
+    byFile[t.file_uuid].push(t.trace_id)
   }
+  
+  operationLoading.value = true
+  operationMessage.value = `Creating group "${name}" with ${traceList.length} trace(s)...`
+  
+  for (const [fileUuid, traceIds] of Object.entries(byFile)) {
+    try {
+      await updateTraceProfileGroup(fileUuid, traceIds, { name })
+    } catch (e) {
+      console.error('Create group failed:', fileUuid, traceIds, e)
+    }
+  }
+  
+  if (selectedFileUuid.value) {
+    await loadClusterResults()
+  }
+  
+  operationLoading.value = false
+  operationMessage.value = ''
+  
+  clearSelection()
 }
 
 async function deleteSelectedClusterTraces() {