Cover v1.5.0-v1.8.0: Tauri desktop shell, dual theme, reminders, PWA, update check - New Desktop-Shell page documenting the Tauri sidecar architecture - Home/_Sidebar/Architecture/Deployment/User-Guide updated to reflect the native desktop installer alongside the legacy CustomTkinter app - Configuration: remind_before_minutes and theme values documented - User-Guide: shiny bosses, PWA install/offline, update check, footer