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/draw/draw/attdef.rs

@@ -188,6 +188,7 @@ impl CadCommand for AttdefCommand {
             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,

src/modules/draw/draw/mline.rs

@@ -170,6 +170,7 @@ impl CadCommand for MlineCommand {
             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,

src/modules/draw/draw/raster_image.rs

@@ -114,6 +114,7 @@ impl CadCommand for ImageCommand {
             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,

src/modules/draw/draw/ray.rs

@@ -89,6 +89,7 @@ impl CadCommand for RayCommand {
             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,
@@ -187,6 +188,7 @@ impl CadCommand for XLineCommand {
             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,

src/modules/draw/draw/revcloud.rs

@@ -96,6 +96,7 @@ impl CadCommand for RevCloudCommand {
             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,

src/modules/draw/inquiry/area.rs

@@ -414,6 +414,7 @@ impl CadCommand for AreaCommand {
             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,

src/modules/draw/inquiry/dist.rs

@@ -81,6 +81,7 @@ impl CadCommand for DistCommand {
             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,

src/modules/draw/inquiry/measuregeom.rs

@@ -72,6 +72,7 @@ impl MeasureGeomCommand {
             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,

src/modules/draw/modify/trim.rs

@@ -4570,6 +4570,7 @@ fn preview_wire(points: Vec<[f32; 3]>, color: [f32; 4], name: &str) -> 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,