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/__tests__/BackupSettings.test.tsx

@@ -0,0 +1,65 @@
+/**
+ * @file BackupSettings.test.tsx
+ * @description Settings → Data → Backup: a save sends only the fields that
+ * changed, "Back up now" is off until a folder is saved, and the newest backup
+ * in the folder is shown.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import i18n from "i18next";
+
+const { backup } = vi.hoisted(() => ({
+  backup: { get: vi.fn(), save: vi.fn(), run: vi.fn() },
+}));
+vi.mock("../../../lib/api", () => ({ api: { settings: { backup } } }));
+
+import { BackupSettings } from "../BackupSettings";
+
+const off = {
+  dir: "",
+  hour: 2,
+  keep: 7,
+  running: false,
+  last: null,
+  files: [],
+  dir_error: null,
+  env_owned: { dir: false, hour: false, keep: false },
+};
+
+beforeEach(() => {
+  i18n.changeLanguage("en");
+  vi.clearAllMocks();
+});
+
+describe("BackupSettings", () => {
+  it("saves only the folder when only the folder changed, then allows a run", async () => {
+    const user = userEvent.setup();
+    backup.get.mockResolvedValue(off);
+    backup.save.mockImplementation((p) => Promise.resolve({ ok: true, ...off, ...p }));
+    render(<BackupSettings />);
+    const run = await screen.findByRole("button", { name: /Back up now/ });
+    expect(run).toBeDisabled();
+    expect(screen.getByText("Backups are off.")).toBeInTheDocument();
+
+    await user.type(screen.getByLabelText("Backup folder"), "/mnt/hdd/b");
+    await user.click(screen.getByRole("button", { name: "Save" }));
+    await waitFor(() => expect(backup.save).toHaveBeenCalledWith({ dir: "/mnt/hdd/b" }));
+    await waitFor(() => expect(run).toBeEnabled());
+  });
+
+  it("shows the newest backup", async () => {
+    backup.get.mockResolvedValue({
+      ...off,
+      dir: "/mnt/hdd/b",
+      files: [
+        { name: "agenthub-20261008-020000.db", size: 2048, mtime: "2026-10-08T02:00:30Z" },
+        { name: "agenthub-20261007-020000.db", size: 1024, mtime: "2026-10-07T02:00:30Z" },
+      ],
+    });
+    render(<BackupSettings />);
+    expect(await screen.findByText(/2\.0 KB · 2 kept, 3\.0 KB in all/)).toBeInTheDocument();
+  });
+});