Build a kanban board like Trello

• Several columns (To do, In progress, Done), each with a title and a list of cards; add a column and rename or delete a column (deleting asks for confirmation if it has cards)
• Add a card to a column, edit its title and description in place or in a small dialog, and delete it
• Drag a card within a column to reorder it and to another column; the drop position is shown by a placeholder or indicator
• Drag also works with the keyboard or provides an accessible alternative (a Move to menu)
• Order is stable and correct after every move, including dropping into an empty column or at the end
• The whole board persists in localStorage and survives a reload
• Column card counts update live; empty columns show a drop target hint

Only after every requirement works.

• Reorder columns by dragging
• Undo and redo for card moves
• Labels, due dates and a filter box