Add "Preserve Seams/UV" Option to Decimate Modifier (Collapse Mode)

Currently, the Decimate Modifier in Collapse mode does not offer a way to preserve UV seams or UV islands. This can lead to broken or heavily distorted UV maps after decimation, making the modifier less useful for workflows where UV integrity is important. The Planar mode already has a "UVs" "Seams"option Yet it leaves the mesh with Ngons, so it would be consistent and valuable to have a similar option for Collapse mode.