- Settings window with tabs: profile (name, email, avatar, password),
appearance (light/dark/system), language (de/en/zh), background
(gradient presets, custom URL, blur toggle); persisted server-side
- i18n dictionaries (de/en/zh) applied across nav, sidebar, tasks,
calendar, time tracking, admin, invites and comments
- Greeting header with time-of-day message, live clock and date; cooler
theme, cards, kanban, calendar grid and data-table styling
- Shared sidebar: nav, collapsible books with per-book pages, top-level
pages, search; user chip opens settings
- Tasks kanban with priorities, overdue flags and book/page links;
calendar month view fed by task deadlines; time view with entries,
durations and totals; top-right live timer with optional book link
- User discovery autocomplete in the invite card; editor gains tables
and checklists; standalone theme buttons removed
