Path tool feedback

1.After adding points to the stroke path and closing the Path's eyes, a path selection box appears in the upper right corner of the canvas.
2. After closing the eye of the pen tool shape's path, the fill color will also disappear.
3. Lines drawn with the Freehand Tool will not connect after their start and end points overlap.

https://github.com/user-attachments/assets/26b5221e-c8c0-4206-a378-4cbc2cd0c70f

The issue names no files, tests, or entry points. Reproduce the three reported Path and Freehand Tool behaviors from the description and locate the affected tool code; done means the selection box, disappearing fill, and failure to connect overlapping endpoints are corrected and covered by verification.

索引モデルが issue の本文から書いたものです。