Add a set of symbols to improve visualization of different snap types.
- Circle: Represents snapping to a vertex.
- Two Aligned Lines: Represent snapping to an edge.
- Closed Aligned Square: Represents snapping to a specific part of an edge (center or perpendicular).
- Face-Aligned Circle with Midline: Represents snapping to a face.
Pull Request: https://projects.blender.org/blender/blender/pulls/109387