The playout expands unknown-length entries to the remaining time of the
timeslot if there is only one unknown-length entry.

undefined duration has special handling in the playout so this should be
supported.

refs #127

refs #127

refs #127

We disabled preflight earlier so we can safely enable the base layer
again.

fixes #211

fixes #198

fixes #212

refs #127

This increases the chance of a perfect 3 column layout.

We often find ourselves adding flex styles to buttons. Instead, this
should be the default.

Although the docs [1] specify a class on Popover components, this
doesn’t seem to be passed down. We help ourselves with a selector for
the data-headlessui-state attribute .

[1] https://headlessui.com/vue/popover