Improve mesh grooming robustness with integrity checking and repair capability

[akenmorris]

• Improve mesh grooming robustness with integrity checking and repair capability #2477

This PR addresses the issues in #2477.

• Add mesh integrity checking throughout grooming pipeline to detect invalid meshes (degenerate triangles, non-manifold edges) early
• Replace extractLargestComponent with repair_mesh for more comprehensive mesh repair; remove UI option and silently ignore deprecated parameter
• Fix fillHoles to remove zero-area triangles created by vtkFillHolesFilter
• Move basic mesh routines from MeshWarper to MeshUtils for reuse
• Remove blocking integrity check from computeNormals() that was too strict
• Fix tab order on mesh grooming page for sinc smoothing options