Shape.OffsetEntity computed joins between consecutive offset segments
but never joined the last segment back to the first, leaving the
closing corner with a straight line instead of a proper miter/arc.
Track the first entity and apply the same join logic after the loop.
Also wrap nest template loading in try-catch so a corrupt template
file doesn't crash the app on startup — falls back to default nest.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
AJ Isaacs
09fc8b889e