DIMALIGNED: 3-click flow (p1 → p2 → dim line position) → DimensionAligned.
Rubber-band preview shows extension lines and dim line offset.
DIMDIAMETER: 3-click flow (center → arc point → text position) → DimensionDiameter.
Previews the diameter chord line.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>