- Replace the branch badge with a compact count badge; recolor the
folder name and badge to sidebar-primary on a tinted row background
when expanded
- Lighten the selected conversation item background so the expanded
folder row stays the strongest signal
- Add a "+" button on each folder header that reuses a single new-
conversation tab across folders, disconnecting the old ACP session
so the connection lifecycle reconnects against the target folder's
working directory
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