Added a thing to listen for enter key-presses in client key input.

api/app/index.html

@@ -176,6 +176,13 @@
 
         refreshServers();
         window.setInterval(refreshServers, 3000);
+        // Add a key listener to the dialog's password field, so pressing ENTER submits the form.
+        const keyInput = document.getElementById("client-key-input");
+        keyInput.addEventListener("keydown", (ev) => {
+            if (ev.code === "Enter") {
+                submitServerRequest();
+            }
+        })
     </script>
 </body>