- Implement Apollonius PPC (Point-Point-Curve) and multi-tangent CCP solvers for lines in arc.rs
- Support tangent line snapping for all 3-input arc combinations (Tangent-Point-Point, Point-Tangent-Point, Tangent-Tangent-Point, Tangent-Point-Tangent, Point-Tangent-Tangent)
- Resolve TangentGeom::Line f32 truncation in snap.rs to preserve true f64 key vertices during tangent evaluation and TangentObject construction
- Preserve strict CUT_TOLERANCE (1e-7) in trim.rs while ensuring tangent contact points are detected accurately
- Add unit tests for line tangency solvers, tangent trim detection, and angular precision sweeps