feat(view): add visual style previews

- preview render modes on hover without committing
- distinguish 2D and 3D wireframe fill and depth behavior

Refs #483

src/modules/annotate/angular_dim.rs

@@ -139,6 +139,7 @@ fn preview_wire(points: Vec<Vec3>) -> WireModel {
         world_width: 0.0,
         depth_override: None,
         fill_is_3d: false,
+        fill_is_2d_solid: false,
         pick_tris: Vec::new(),
         pick_tris_low: Vec::new(),
             dash_from_start: false,