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/format.ts

@@ -552,3 +552,11 @@ export function pathBasename(p: string | null | undefined): string | null {
   const idx = trimmed.lastIndexOf("/");
   return idx === -1 ? trimmed : trimmed.slice(idx + 1) || trimmed;
 }
+
+/** 1536 → "1.5 KB"; binary units, one decimal from KB up. */
+export function formatBytes(bytes: number): string {
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
+  if (bytes < 1024 ** 3) return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
+  return `${(bytes / 1024 ** 3).toFixed(1)} GB`;
+}