Gradient tool snapping with locked angle

Reproduction

1. New document
2. Draw rectangle
3. Use the gradient tool to draw a gradient
4. Press Ctrl or Shift to lock the angle
5. Observe how the snapping to the rectangle no longer occurs and any old overlays get stuck until finishing the drag

Video

https://github.com/user-attachments/assets/de604938-8d10-46bd-917b-4ac8a09dde3a

Relevant code

The line tool uses SnapConstraint::Line to snap when constrained to an angle: https://github.com/GraphiteEditor/Graphite/blob/f7562b6fd7428f887ba8ed833692535ad9b94ec4/editor/src/messages/tool/common_functionality/shapes/line_shape.rs#L157-L164

The gradient tool completely ignores snapping when an angle constraint exists: https://github.com/GraphiteEditor/Graphite/blob/f7562b6fd7428f887ba8ed833692535ad9b94ec4/editor/src/messages/tool/tool_messages/gradient_tool.rs#L599-L610 https://github.com/GraphiteEditor/Graphite/blob/f7562b6fd7428f887ba8ed833692535ad9b94ec4/editor/src/messages/tool/tool_messages/gradient_tool.rs#L631