resolveGoverningBooking() was letting an upcoming (not-today) booking govern colour,
so any room with something booked within the 7-day lookahead showed green 'Booked'
regardless of how far off the arrival was. 'booked' should only apply when someone's
actually arriving tonight.
Now a booking only governs state/colour when it covers today (arriving today,
mid-stay, or departing today) — otherwise the room is genuinely vacant. The soonest
upcoming booking (if any) is surfaced separately as vacant_nights, a countdown to
the next arrival, purely informational and no longer tied to colour. Dashboard shows
'Vacant N nights' when something's booked within the window, or 'Vacant 7+ nights'
when nothing was found in the fetched window at all.
New zone_state.vacant_nights column, threaded through saveZoneState/pollOnce/status.js.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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