Checklists: drag to reorder, one tap to delete

Two finishing touches on checklists, both about keeping the list honest with zero ceremony:

• Drag the six dots at the start of any item to reorder it — the same lift-and-drop you already know from reordering to-dos themselves: the row floats with your finger, a thin line shows where it will land, and on a phone a short press lifts it. Unchecked items reorder among themselves and stay above the checked pile. On a keyboard, Alt+↑/↓ does the same.
• Delete an item with one tap on the × at the end of its row. On a computer it appears when you point at the row; on your phone it's always quietly there. (The old ways still work: empty a row and press Backspace, or just clear the text and close.)