Cart drawer: remove an event via an inline confirm popover, an in-drawer empty state that slides and fades out on close, and fullscreen-on-open on mobile.
Fixes:
"Browse events" now navigates to the collection events page
(/collection/?id=…) instead of the cart route.
The remove-confirm popover aligns within the drawer (React/Vue parity) and no
longer blocks the drawer's close button while open.