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/lib/chatUi.ts

@@ -0,0 +1,65 @@
+/**
+ * @file chatUi.ts — the viewer's Chat UI choice: whether a Claude/Codex pane
+ * opens as a chat (`PaneChat`, like Claude Desktop) instead of its terminal.
+ * Kept by the server per ACCOUNT (`GET/PUT /api/me/prefs`, key
+ * `agenthub.chatUi` = "1"; local mode is one account), so it follows a user to
+ * any browser and differs between users of one dashboard. Read once per page
+ * load and shared through `useChatUi`; `saveChatUi` updates every reader at
+ * once and puts the old value back if the save fails.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { useEffect, useSyncExternalStore } from "react";
+import { api } from "./api";
+
+export const CHAT_UI_KEY = "agenthub.chatUi";
+
+let chatUi = false;
+let loading: Promise<void> | null = null;
+const listeners = new Set<() => void>();
+
+const emit = (next: boolean) => {
+  chatUi = next;
+  listeners.forEach((fn) => fn());
+};
+
+function load() {
+  // A failed read (logged out, offline) must never take a page down with it.
+  loading ??= Promise.resolve()
+    .then(() => api.me.prefs())
+    .then(
+      (r) => emit(r.prefs[CHAT_UI_KEY] === "1"),
+      () => {
+        loading = null; // the next reader asks again
+      }
+    );
+}
+
+export function useChatUi(): boolean {
+  useEffect(load, []);
+  return useSyncExternalStore(
+    (fn) => {
+      listeners.add(fn);
+      return () => listeners.delete(fn);
+    },
+    () => chatUi
+  );
+}
+
+export async function saveChatUi(on: boolean): Promise<void> {
+  const before = chatUi;
+  emit(on);
+  try {
+    const r = await api.me.savePrefs({ [CHAT_UI_KEY]: on ? "1" : null });
+    emit(r.prefs[CHAT_UI_KEY] === "1");
+  } catch (err) {
+    emit(before);
+    throw err;
+  }
+}
+
+/** Tests: forget what was read. */
+export function __resetChatUi() {
+  chatUi = false;
+  loading = null;
+}