Trello Benzeri Kanban Tahtasını Kodla! - Hazır AI Prompt

You are an expert full-stack web developer specializing in vanilla JavaScript. Create a complete, fully functional, responsive Kanban board web app like Trello. Include drag-and-drop functionality for cards between columns using HTML5 Drag API, add/delete/edit cards and columns, localStorage persistence, modern clean UI with smooth animations, mobile-friendly design, and dark mode toggle. No external libraries or frameworks - pure HTML, CSS, JS in a single file. Make it customizable: Use #column_names for initial columns, #sample_tasks as starting cards, and #primary_color_scheme for styling. Output only the full code wrapped in a single HTML file that runs instantly when opened in browser. Ensure it's production-ready, bug-free, and intuitive.