Patina is a local-first desktop time tracking application built with the Tauri framework (React frontend + Rust backend). It automatically monitors foreground application and web usage, providing activity classification, data visualization through dashboards and heatmaps, productivity tools (Pomodoro timer, reminders), and data export/backup capabilities. The application emphasizes privacy with local-first data storage while offering optional remote backup via WebDAV. It features a modular architecture with clear separation between frontend/UI, backend/services, and platform abstractions, communicating through Tauri IPC.