Address Task 3b quality review:
- FormatSize now emits invariant decimal notation so a comma-decimal
locale cannot produce stock text its own invariant parser rejects.
- Validation notices embed a bounded single-line preview instead of the
full cell value.
- Documented GetPlateOptions' all-or-nothing throwing contract.
- STA test helpers run the worker as a background thread with a
diagnostic timeout message; added a de-DE fractional stock round-trip
regression.
Capture the report target and reject whole-job nesting, open progress
windows, interactive fill and busy plate actions across every view
sharing the nest; revalidate after the save dialog, capture the snapshot
synchronously on the UI thread and render it through OpenNest.Reporting.
Windows adapter tests cover enablement, guards, cancel, success and a
write failure against an existing destination (compile-only on Linux;
Windows runtime acceptance still owed).
The docked side panel could only be closed with Escape, which was
unreliable: MainForm consumes Escape before ActionLeadIn's KeyDown
handler, so with a part selected ActionManager called the action's
empty CancelAction and nothing happened; with nothing selected the
panel closed but was stored as the previous action, so the next
Escape reopened it.
- EditNestForm side panel gets a header with the panel title and an
always-visible close button that ends the action.
- ActionLeadIn.CancelAction now steps back (unlock contour, then
deselect part), replacing the dead KeyDown handler.
- Actions can opt out of Escape-resume (ResumeOnEscape); the lead-in
action does, so a closed panel stays closed.
aj