agent_ui: Fix fallback icon used for external agents (#44777)
When an external agent doesn't provide an icon, we were using different
fallback icons in all the places we display icons (settings view, thread
new menu, and the thread view toolbar itself).
Release Notes:
- N/A
e9073eceebDanilo Leal committed on 12/14/2025, 1:48:23 PM· committed by GitHubparent00169e0