only able to delete the parent node

src/lib/components/chat/Assistant.svelte

@@ -110,7 +110,7 @@
 </script>
 
 <article
-	class="relative flex w-full flex-col rounded-3xl border border-border bg-background p-5 shadow-lg/5 lg:w-[600px]"
+	class="group/assistant relative flex w-full flex-col rounded-3xl border border-border bg-background p-5 shadow-lg/5 lg:w-[600px]"
 	style={rowHeight ? `min-height: ${rowHeight}px` : ''}
 >
 	<div class="nodrag pointer-events-auto flex flex-1 cursor-auto flex-col justify-between">

src/lib/components/chat/User.svelte

@@ -40,6 +40,7 @@
 	let messages = $derived((nodeData.current?.data.messages as ChatMessage[]) ?? []);
 	let isFirstNode = $derived((nodeData.current?.data.isFirstNode as boolean) ?? false);
 	let showWelcome = $derived((nodeData.current?.data.showWelcome as boolean) ?? true);
+	let isParentNode = $derived((nodeData.current?.data.isParentNode as boolean) ?? false);
 
 	let prompt = $state.raw<string>((nodeData.current?.data.prompt as string) ?? '');
 	let loading = $state.raw<boolean>(false);
@@ -422,7 +423,7 @@
 	</div>
 	{#if isFirstNode}
 		<Welcome bind:showWelcome />
-	{:else}
+	{:else if isParentNode}
 		<Button
 			size="icon-lg"
 			variant="outline"

src/lib/components/flow/actions/ContextMenu.svelte

@@ -32,6 +32,7 @@
 			},
 			data: {
 				role: 'user',
+				isParentNode: true,
 				selectedModels: modelsState.models.slice(0, MAX_DEFAULT_MODELS) as ChatModel[]
 			}
 		};

src/routes/+page.svelte

@@ -38,6 +38,7 @@
 				data: {
 					isFirstNode: true,
 					showWelcome: true,
+					isParentNode: true,
 					selectedModels: modelsState.models.slice(0, MAX_DEFAULT_MODELS) as ChatModel[]
 				}
 			}