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/pages/__tests__/Settings.test.tsx

@@ -65,6 +65,18 @@ vi.mock("../../lib/api", async (importOriginal) => {
             env_owned: { redact_secrets: false, ignore_cwd: false },
           })),
         },
+        backup: {
+          get: vi.fn(async () => ({
+            dir: "",
+            hour: 2,
+            keep: 7,
+            running: false,
+            last: null,
+            files: [],
+            dir_error: null,
+            env_owned: { dir: false, hour: false, keep: false },
+          })),
+        },
       },
     },
   };