fix: flush pending headers in remote weaviate experimental page

Author: shubham3121

frontend/src/pages/ExperimentalRemoteWeaviateDatasetPage.vue

@@ -1067,6 +1067,9 @@ const removeHeader = (index: number) => {
 const handleCreate = async () => {
   if (!isFormValid.value) return
 
+  // Flush any pending header input so it isn't silently lost
+  addHeader()
+
   isCreating.value = true
   creationError.value = ''