`Sample Points` Node: Sampled path not closed and duplicate endpoint

[Ezbaze]

What happened?

• When sampling a closed Bezier path, the resulting BezPath remains open.
• In adaptive mode on closed paths, the first point is duplicated at the end.

Steps to reproduce

1. Use the Sample Points node on a closed shape (e.g. square or circle).
2. Enable adaptive spacing.
3. Observe that:
   • The sampled path doesn’t include a ClosePath, so it’s rendered open.
   • There is a duplicate vertex at the start/end of the loop.

Expected behavior

• The sampled path should end with a ClosePath if the source was closed.
• No duplicate point should be emitted at the final sample.