refactor(entities): collocate ui_name + dxf_name into entities/names.rs

Two near-identical match-on-EntityType tables lived far apart:
scene/properties.rs::entity_type_name returned mixed-case UI labels;
app/commands.rs::entity_type_name returned uppercase DXF record names.
Both enumerated ~30 variants; adding a new entity meant remembering to
touch two files in two crates' worth of source layout.

Move both into a single entities/names.rs as `ui_name()` and
`dxf_name()`. Adjacent so a new variant gets both labels added at once;
function names make the intended audience explicit at the callsite.

scene/properties.rs and app/commands.rs each lose their local match
plus one re-export, gaining a `crate::entities::names::*` call.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

src/scene/properties.rs

@@ -62,54 +62,8 @@ pub fn fallback_properties(_handle: Handle, entity: &EntityType) -> PropSection
         props: vec![Property {
             label: "Type".into(),
             field: "type",
-            value: PropValue::ReadOnly(entity_type_name(entity).into()),
+            value: PropValue::ReadOnly(crate::entities::names::ui_name(entity).into()),
         }],
     }
 }
 
-pub fn entity_type_name(e: &EntityType) -> &'static str {
-    match e {
-        EntityType::Point(_) => "Point",
-        EntityType::Line(_) => "Line",
-        EntityType::Circle(_) => "Circle",
-        EntityType::Arc(_) => "Arc",
-        EntityType::Ellipse(_) => "Ellipse",
-        EntityType::Spline(_) => "Spline",
-        EntityType::LwPolyline(_) => "Polyline",
-        EntityType::Polyline(_) => "Polyline",
-        EntityType::Polyline2D(_) => "Polyline2D",
-        EntityType::Polyline3D(_) => "Polyline3D",
-        EntityType::PolyfaceMesh(_) => "PolyfaceMesh",
-        EntityType::PolygonMesh(_) => "PolygonMesh",
-        EntityType::Text(_) => "Text",
-        EntityType::MText(_) => "MText",
-        EntityType::Dimension(_) => "Dimension",
-        EntityType::Leader(_) => "Leader",
-        EntityType::MultiLeader(_) => "MultiLeader",
-        EntityType::Tolerance(_) => "Tolerance",
-        EntityType::Insert(_) => "Block Reference",
-        EntityType::Block(_) => "Block",
-        EntityType::BlockEnd(_) => "Block End",
-        EntityType::Hatch(_) => "Hatch",
-        EntityType::Solid(_) => "Solid",
-        EntityType::Face3D(_) => "3D Face",
-        EntityType::Solid3D(_) => "3D Solid",
-        EntityType::Region(_) => "Region",
-        EntityType::Body(_) => "Body",
-        EntityType::Mesh(_) => "Mesh",
-        EntityType::Ray(_) => "Ray",
-        EntityType::XLine(_) => "XLine",
-        EntityType::MLine(_) => "MLine",
-        EntityType::Viewport(_) => "Viewport",
-        EntityType::RasterImage(_) => "Raster Image",
-        EntityType::Wipeout(_) => "Wipeout",
-        EntityType::Underlay(_) => "Underlay",
-        EntityType::Shape(_) => "Shape",
-        EntityType::Table(_) => "Table",
-        EntityType::AttributeDefinition(_) => "Attribute Definition",
-        EntityType::AttributeEntity(_) => "Attribute",
-        EntityType::Ole2Frame(_) => "OLE Frame",
-        EntityType::Seqend(_) => "Seqend",
-        EntityType::Unknown(_) => "Unknown",
-    }
-}