In-app browser annotation tooltip can be clipped and impossible to dismiss

What happened?

In the Codex desktop app in-app browser, the "Try Annotation Mode" tooltip can appear clipped at the edge of the browser panel. When clipped, the dismiss control is not visible and the tooltip covers the annotation icon, so there is no obvious way to close it.

Steps to reproduce

1. Open the Codex desktop app.
2. Open the in-app browser.
3. Trigger or receive the "Try Annotation Mode" tooltip.
4. Observe the tooltip near the browser panel edge.

Expected behavior

The tooltip should stay within the visible browser/app bounds, and any dismiss control should remain visible and clickable.

Actual behavior

The tooltip is clipped horizontally. The dismiss control is not visible, and the tooltip covers the annotation icon.

The tooltip persisted after:

• Pressing Escape.
• Clicking outside the tooltip.
• Hiding/closing and reopening the in-app browser panel.
• Toggling the in-app browser visibility.

Environment

• Codex desktop app: 26.513.31313, build 2867
• macOS: 26.5, build 25F71
• Surface: Codex in-app browser

Notes

A screenshot is available showing the clipped tooltip state.

<img width="514" height="336" alt="Image" src="https://github.com/user-attachments/assets/698026e2-73f1-4349-94b6-806d79076d70" />