Remove dead programIdFont field, unused imports (OpenNest.CNC,
System.ComponentModel, OpenNest.Math, System.Collections.ObjectModel).
PlateView is now 692 lines (down from 1035).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Move all selection state and operations (SelectedParts, SelectedCutOffs, DeselectAll, SelectAll, AlignSelected, RotateSelectedParts, PushSelected, GetPartAt*, GetPartsFromWindow, DeleteSelected) into a new internal SelectionManager class. PlateView retains public forwarding methods and properties to preserve the existing API surface. SelectedCutOff property kept public for WinForms designer compatibility.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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