Recall the last command with ArrowUp in the game terminal

Pressing ArrowUp while the input field is focused now repopulates it
with the last submitted command, cursor placed at the end.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

assets/game1.js

@@ -418,6 +418,17 @@ document.addEventListener('DOMContentLoaded', async () => {
           const inputField = document.getElementById('input-message');
           inputField.disabled = false;
 
+          let lastCommand = '';
+
+          // Recall the last submitted command on ArrowUp, cursor at the end
+          inputField.addEventListener('keydown', (e) => {
+            if (e.key === 'ArrowUp') {
+              e.preventDefault();
+              inputField.value = lastCommand;
+              inputField.setSelectionRange(inputField.value.length, inputField.value.length);
+            }
+          });
+
           // Add event listener for Enter key
           inputField.addEventListener('keypress', async (e) => {
             if (e.key === 'Enter') {
@@ -431,6 +442,7 @@ document.addEventListener('DOMContentLoaded', async () => {
               messageContainer.appendChild(msgEl);
 
               if (message && apiEchoUrl) {
+                lastCommand = message;
                 inputField.value = '';
                 try {
                   const response = await fetchJson(apiEchoUrl, {