[BUG]: Stop button is obscured by model controls in iOS standalone PWA #38210

Description

When OpenCode is installed on the iPhone home screen and opened as a standalone web app, the composer controls do not fit correctly while a response is running. The Stop button is obscured by the model/reasoning controls on the right, making it difficult or impossible to stop the active response.

This appears to be a regression of #11613, which was closed after mobile prompt controls were made responsive.

Expected behavior: The Stop button should always remain visible and have a usable touch target while a response is running. On narrow screens, the selector labels should shrink, truncate, wrap, or collapse before covering the Stop button.

Plugins

Not known to be plugin-specific.

OpenCode version

1.18.3

Steps to reproduce

1. Run OpenCode Web and install it on the iPhone home screen.
2. Open it in standalone mode on an iPhone 17 Pro Max running the latest iOS 27 developer beta.
3. Open a thread and start a response.
4. Use the visible agent/model configuration shown in the screenshot, including the longer agent and model names.
5. Inspect the right side of the composer while the response is running.
6. The Stop button is covered or clipped by the model/reasoning controls and cannot be reliably tapped.

Screenshot and/or share link

Operating System

iPhone 17 Pro Max, latest iOS 27 developer beta, standalone home-screen PWA

Terminal

Not applicable — standalone iOS home-screen PWA