The calendar was set to height 'auto', which sizes each week row to its own
content, so a month of mostly empty days collapsed into thin strips. It now
takes a viewport-relative height and expandRows shares that evenly across the
weeks, with a floor under each day cell so a short window squeezes the grid back
down rather than the rows vanishing.
New notifications now have "Show on Shopfloor Dashboard" ticked. The board is
where these are meant to be read, and starting unticked meant most were written
and then never appeared on it.
Only the default for a NEW notification. Editing an existing one still loads its
stored value, so nothing that was deliberately turned off gets flipped back on,
and the column default is left alone so an API or import caller that omits the
field keeps the behaviour it has today.
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