Empty space + visible scrollbar for no reason

[KucharczykL]

For some reason sometimes the table has a scrollbar and empty space underneath:

[KucharczykL]

Resolved by #57 (commit b6f6da3).

Root cause was shared with the horizontal-scrollbar variant: the NameWithIcon game-name tooltip is a Flowbite popover hidden via Tailwind invisible (= visibility:hidden), which still occupies layout. Flowbite re-initialises popovers on htmx:afterSettle; Popper then parks each hidden popover with a transform offset. A laid-out element parked off to the side/below expands its scroll container → a phantom scrollbar with empty space (vertical here, horizontal in the sibling report).

Fix: [&.invisible]:hidden on the popover class, so it's display:none (removed from layout) while hidden; Flowbite drops invisible on show, restoring display. An e2e regression asserts the table wrapper does not become scrollable after a swap.