The year list comes back sorted, so picking its last element meant Vacay always
landed on the highest year — add 2030 to plan ahead and every visit from then on
opened 2030. It now opens the leave-year period today falls into, falls back to
the closest year the plan has when that period has none, and keeps the year the
viewer is on when a live update reloads the list.
The server owns the arithmetic entitlements are computed with, but the grid has
to render the same twelve months and the overlays have to filter against the
same range, so the window resolves on both sides. yearWindow.ts is that mirror,
including the Feb-29 clamp and the anniversary-without-a-hire-date fallback.
The store loads the settings before the year list picks a default — with a
shifted year the current period is not necessarily the current calendar year.
Holidays are fetched per calendar year the window touches and clipped back to
what the grid draws; a school break straddling New Year comes back from both
fetches, so markers are de-duplicated per day. The label is part of that
identity, otherwise two calendars left on the same colour collapse into one.
Maurice