The previous fix made publishDaySlots CLOSE rows instead of DELETE them.
That works correctly on the server, but the live mini-program still ships
the old schedule.vue which only knows about isPublished (no status
field). It would re-render the CLOSED rows with the '已发布' badge,
making it look like 'clear day' did nothing.
Hide CLOSED rows from getSchedulePreview so the legacy client shows
'当日暂无排课' for rest days — the same UX it had before this fix
shipped. All-CLOSED days return []; days with a mix return only the
non-CLOSED rows; days the cron hasn't touched still return the ghost
template.
The republished mini-program (with status-aware rendering) will see the
same [] for rest days, which is consistent. Tests: 4 new specs covering
all-OPEN / all-CLOSED / mixed / empty-day cases.
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