feat: Add material dimensions with typed properties
Implement TPH inheritance for material dimensions:
- MaterialShape enum with display names and parsing
- MaterialType enum (Steel, Aluminum, Stainless, etc.)
- MaterialDimensions base class with derived types per shape
- Auto-generate size strings from typed dimensions
- SortOrder field for numeric dimension sorting
Each shape has specific dimension properties:
- RoundBar: Diameter
- RoundTube: OuterDiameter, Wall
- FlatBar: Width, Thickness
- SquareBar/Tube: Size, Wall
- RectangularTube: Width, Height, Wall
- Angle: Leg1, Leg2, Thickness
- Channel: Height, Flange, Web
- IBeam: Height, WeightPerFoot
- Pipe: NominalSize, Wall, Schedule
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
AJ Isaacs
4f6d986dc9