[BUG]: Discovered favicon not shown in sidebar #18746

Description

When OPENCODE_EXPERIMENTAL_ICON_DISCOVERY=true is set, Project.discover() finds the favicon and saves it to icon.url, but the sidebar avatar in sidebar-items.tsx only reads icon.override. So the discovered icon is never actually displayed — you just get the default letter fallback.

OpenCode version

1.3.0

Steps to reproduce

1. Set OPENCODE_EXPERIMENTAL_ICON_DISCOVERY=true
2. Place a favicon.png in a project root
3. Open the project in the web UI
4. Sidebar still shows the letter fallback, not the favicon

Operating System

macOS