Advanced To-Do List App (Tkinter GUI) A simple, clean, and fully functional To-Do List desktop application built with Python and Tkinter. This version includes: ✅ Task checkboxes 🗓️ Deadlines 🌙 Dark mode toggle 🎨 Styled interface with a modern look ✨ Features Add Tasks: Type your task and optionally provide a deadline (YYYY-MM-DD format). Mark as Done: Tick the checkbox when a task is complete. Delete Completed Tasks: Remove all checked tasks with one click. Dark Mode Toggle: Switch between Light and Dark themes seamlessly. Responsive UI: Clean layout with dynamic theme changes.