Fix: Enable up and down arrow keys in chat input (#1254)

Co-authored-by: Venkata Sai Keerthi Swarna <vskirthi@amazon.com>

Author: keerthi-swarna

packages/jupyter-ai/src/components/chat-input.tsx

@@ -235,6 +235,11 @@ export function ChatInput(props: ChatInputProps): JSX.Element {
 
   const inputExists = !!input.trim();
   function handleKeyDown(event: React.KeyboardEvent<HTMLDivElement>) {
+    if (['ArrowDown', 'ArrowUp'].includes(event.key) && !open) {
+      event.stopPropagation();
+      return;
+    }
+
     if (event.key !== 'Enter') {
       return;
     }