Settings page: themes (Dark, Light, Cyberpunk, Retro) with xterm palettes and hub-synced choice, change password, access tokens, about

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

PLAN.md

@@ -220,6 +220,13 @@ something long in one, switch away and back, refresh — it's all still there.
 - **Terminal extras** — search, copy-mode, font/theme, split panes, upload via
   drag-drop into cwd.
 
+- **Settings + themes** — **shipped 2026-09-18** (`Settings.tsx`, `themes.ts`): Settings
+  page with Appearance (Dark, Light, Cyberpunk, Retro — CSS variables on `<html>` plus a
+  matching xterm palette, applied before first paint from localStorage and synced hub-side
+  via `GET/PUT /api/prefs/ui` so the choice follows the login), Account (change password,
+  `POST /api/password`, current password required), Access tokens (list/revoke the tokens
+  hubs hold), About (version, host, arch, uptime, certificate).
+
 ## Open questions
 
 - Idle-session reaping policy (never / after N days) — leaning never; it's a