vscode.dev/agents: Enter does not submit GHE.com instance on Android

Does this issue occur when all extensions are disabled?: Yes. This occurs on the hosted `vscode.dev/agents` page before GitHub Enterprise authentication completes.

- VS Code Version: Current production build served by `https://vscode.dev/agents` on 2026-08-23
- OS Version: Android 16, OnePlus 15
- Browsers: Chrome and the OnePlus built-in browser
- On-screen keyboards: Microsoft SwiftKey and Gboard
- Feature: Agents page, GitHub Enterprise Cloud sign-in

Steps to Reproduce:

1. Open `https://vscode.dev/agents` on Android.
2. Start sign-in for a GitHub Enterprise Cloud account.
3. Enter a valid GHE.com hostname, such as `company.ghe.com`, in the prompt "What is your GHE.com instance?"
4. Press the on-screen keyboard Enter, Done, or checkmark action.
5. Repeat with another Android keyboard and browser.

Expected behavior:

The input is accepted and the GitHub Enterprise authentication flow continues.

Actual behavior:

Nothing happens. The input remains open and authentication cannot continue. The same GHE.com hostname works from a PC browser.

The problem reproduces with both SwiftKey and Gboard, and with both Chrome and the OnePlus built-in browser. This makes the GitHub Enterprise sign-in flow unusable from the Android Agents page.

Related reports:

- #280016 reported that Enter did not submit `showInputBox` prompts in VS Code Web. It was closed after the requested diagnostics arrived after the automatic closure.
- #302363 tracks the broader need for a mobile-optimized Agent Mode view.

The real enterprise hostname is redacted because this is a public issue. A screenshot is available, but it contains the hostname and machine name.