Browsing the saved-nest list was slow because arrowing to each row
downloaded that nest's archive from scratch. NestDetailsSession now
keeps a small LRU cache and exposes Prefetch(id); SavedNestsForm warms
the rows around the highlight once its own details are showing, so
arrowing through the page mostly resolves from cache instead of
re-downloading each nest.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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or failure of a superseded load are discarded; IsLoading follows only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.