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.

client/src/components/settings/AppearanceSettings.tsx

@@ -3,6 +3,7 @@
  * @description Settings → Appearance (`/settings/appearance`): the interface language, the
  * terminal font (`lib/terminalFont.ts`, with a preview line), the
  * Dark / Light / System mode switch and one named-theme picker per mode, and the
+ * per-user Chat UI switch (`ChatUiSettings`, `#chat-ui`), the
  * corner pet (`PetSettings`, deep-linked as `#pet`) — the old General and Pet
  * pages redirect here. Theme state is in `hooks/useTheme.ts`, palettes in
  * `index.css`. Each card's swatch re-scopes the theme's CSS variables on its
@@ -17,6 +18,7 @@ import { useTranslation } from "react-i18next";
 import { Monitor, Moon, RotateCcw, Sun } from "lucide-react";
 import { SettingsRow, SettingsSection, SettingsSegmented } from "./SettingsRow";
 import { PetSettings } from "./PetSettings";
+import { ChatUiSettings } from "./ChatUiSettings";
 import { THEMES, useTheme, type Theme, type ThemeMode } from "../../hooks/useTheme";
 import { confirmDialog } from "../../lib/confirm";
 import { toast } from "../../lib/toast";
@@ -146,6 +148,8 @@ export function AppearanceSettings() {
         </p>
       </SettingsSection>
 
+      <ChatUiSettings />
+
       <section id="theme" className="card p-5 space-y-5 scroll-mt-24">
         <h3 className="text-sm font-semibold text-fg-primary">{t("appearance.theme")}</h3>
         <SettingsRow