sleek is a cross-platform desktop todo.txt manager built with Electron, React 19, and Material UI. It provides a full-featured interface for managing tasks using the todo.txt format, supporting priorities, contexts, projects, due dates, recurrence, pomodoro tracking, and hidden attributes. The application reads and writes plain-text todo files, offering real-time file watching, archiving to done.txt, and safe atomic writes. It includes a custom filter language with boolean expressions and date math, a drawer for attribute-based filtering and grouping, and a grid view with inline editing. The architecture follows a standard Electron pattern: a main process handles file I/O, IPC, system tray, notifications, and window management, while the renderer process runs the React UI. External dependencies include the jstodotxt parser, chokidar for file watching, electron-store for persistence, and Matomo for optional analytics. The codebase is well-structured with clear separation of concerns, though some areas show signs of technical debt such as duplicate test helpers, disabled end-to-end tests in CI, and a long migration chain for settings.