The Details area of the Database-mode Open dialog now has a plate
preview beside the Plates/Drawings tabs, with a draggable divider. It
draws one plate of the highlighted nest; the arrow buttons below it step
through the plates ("Plate 2 of 5"), and choosing a row on the Plates tab
shows that plate, so the table and the preview stay on the same plate.
The preview is read-only (no selection or drop) and refits when resized.
NestDetails keeps the downloaded nest's plates (PlateLayouts) beside its
rows, so the preview draws the copy already read for the tables with no
second download.
Tests: NestDetails keeps every plate in nest order (fails with the
assignment removed). The Windows form test steps forward with the
button, checks the row follows, and selects a row back.
The server stores only nest-level metadata, so a browser that shows a
saved nest's plates and drawings has to read them from its archive.
NestDetails.FromNest turns a nest into one row per plate (duplicates,
size, parts and distinct drawings without cutoffs, utilization; 0 for a
zero-size plate rather than NaN) and one row per non-cutoff drawing
(required, nested across every plate's duplicates, remaining, area),
plus the nest's units.
NestDetailsSession loads the details of the highlighted nest. A new
load or Clear supersedes the previous one before cancelling it, so a
load that completes synchronously on cancellation and any late result
or failure of a superseded load are discarded; IsLoading follows only
the latest load.
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