Cargo: codec aad7053, kernel 1a52eaf, graph 263de59; honour viewport clipping

Brings codec PRs #84 (cross-version visual styles, table styles,
subentity managers), #88 (viewport clipping flag, DXF boundary handle),
#89 (DXF viewport snap/twist in degrees) and #92 (field format codes,
event updates).

With #88 a viewport keeps a stored boundary whether or not clipping is
on, so a linked boundary alone no longer means "clipped": rendering,
paper picking, VPCLIP and the Clipped property check the clipping flag
too, and VPCLIP / MVIEW Object and Polygon set it. Before, OCS never set
the flag, so its clipped viewports opened rectangular elsewhere.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/viewport_dimension_tests.rs

@@ -147,6 +147,7 @@ fn viewport_dimension_curved_clip_includes_the_exact_boundary() {
         panic!()
     };
     vp.clip_boundary_handle = clip;
+    vp.status.non_rectangular_clipping = true;
     assert!(scene
         .viewport_displays_paper_point(frame.viewport, glam::DVec2::new(boundary.x, boundary.y)));
     assert!(!scene.viewport_displays_paper_point(frame.viewport, glam::DVec2::new(60.01, 50.0)));
@@ -463,6 +464,7 @@ fn viewport_dimension_eligibility_is_shared_and_uses_clipping() {
     let clip = scene.add_entity(EntityType::LwPolyline(clip));
     if let Some(EntityType::Viewport(vp)) = scene.document.get_entity_mut(top) {
         vp.clip_boundary_handle = clip;
+        vp.status.non_rectangular_clipping = true;
     }
     assert_eq!(
         scene