Improve update available notification styling

[Weisl]

Context

The red alert styling (row.alert = True) was removed from the update available notification in ui/renaming_panels.py as a quick fix. The current state shows a plain label with an ERROR icon.

Task

Revisit the update available notification for the next release and implement a better, less intrusive visual style that still clearly communicates that an update is available — without the aggressive red alert color.

Current state

row.label(text=f"Update available: v{latest_version_str}", icon='ERROR')

Ideas

• Use a different icon (e.g. INFO or RECOVER_LAST)
• Consider a dedicated panel section or subtle highlight instead of alert color