On wide screens a click on an event now opens its card next to it
instead of the side panel. The card stays until it is closed and has
edit, delete, more and close buttons at the top, a square in the
event's colour beside the title, and a line naming the calendar.
More opens the same menu as a right-click (duplicate, export, copy).
Delete asks for confirmation inside the card, and edit goes straight
to the form. Hover previews still work as before while no card is
open. Phones keep opening the full editor.