buildExportLoadListHtml's wagon table (origin export doc, Marshalling
2/3, and the intercity fallback) had no station columns — only the
import doc did. Adds Departure Station / Arrival Station per row,
mirroring the import doc's existing pattern: a whole-route wagon reads
the schedule's own origin/destination, a leg-slot wagon reads its own
boardYardId/alightYardId instead (resolved via a new yardLabelById
opt, computed once per document from board+alight yard ids across the
trainSet).
Also fixes two pre-existing off-by-one colspans on the EMPTY row and
the 'No wagons on this train set' placeholder, now that the real
column count changed with the two new ones.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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