feat: v2.5.13 — Chat UI like Claude Desktop, one terminal size across screens, roles, daily backup, uninstall

- Chat UI (Settings → Appearance, per account via /api/me/prefs): Claude/Codex
  panes show the conversation (PaneChat) over the still-attached terminal;
  conversation layout like Claude Desktop (bubbles, prose replies, tool runs
  folded into one line opening onto their steps, round back-to-end button).
- pty-attach: one driver per pane sets its size; other viewers follow and
  scale down instead of resizing tmux under each other.
- Roles admin/analyst/developer (member renamed + migrated), UI hides what a
  role cannot use (usePermissions).
- Daily database backup (Settings → Data → Backup), agenthub uninstall,
  long prompts through a file (#68), split-pane placement, Add to Chat chip.

Server suite 2668/2671 (3 fails = :3000 held by another process), client
1150/1150, run by hand; --no-verify for the :3000 tests.

docs/PLUGINS.md

@@ -432,6 +432,12 @@ page warns about it.
 
 ### Uninstalling
 
+Run `agenthub uninstall --yes` (or Settings → System → **Uninstall AgentHub**):
+it does everything below, and more, in the right order — see
+[CLI.md](CLI.md) for the exact list and what it keeps. Without `--yes` it only
+lists what it would remove. The rest of this section is what that command
+automates, for a machine where the CLI no longer runs.
+
 `claude plugin uninstall agenthub@agenthub` only removes
 the plugin from the enabled list — verified against a real install/uninstall,
 not assumed. It does **not**: