fix: drop nil day counts before taking the minimum

chime--days-until-event maps over every timestamp on an event and keeps a day count only for the all-day ones. A timed timestamp maps to nil. An event carrying both kinds handed -min a list with a nil in it, which signals wrong-type-argument. An event with no all-day timestamp handed it an empty list, which signals too.

Both crash on every tick once chime-day-wide-advance-notice is on. The recurring failure walks the async counter up to the persistent-failure warning.

The map now runs through -non-nil, and an empty result returns nil, which the docstring already promised. I added a nil branch to chime--day-wide-notification-text so a nil count can't reach the = comparisons. The advance-notice window should already exclude an event with no all-day timestamp, so that branch is a guard rather than a live path.

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