Point clouds: attach dialog, crop toolbar, stylize, palette rows

POINTCLOUDATTACH opens the Attach Point Cloud dialog after the file is
chosen; its Attach button lives in the Attach Underlay list instead of a
separate Insert panel. A selected cloud brings the crop tools to the
right-edge toolbar. POINTCLOUDSTYLIZE sets the stylization with the
reference's prompts, the External References palette lists point clouds
(unload, reload, detach, path), and definitions keep the header extents.

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

src/app/view/mod.rs

@@ -1604,6 +1604,11 @@ bg={bg_ms:.1}ms n={view_count}"
                 None
             } else if self.ribbon.xref_context() {
                 crate::ui::side_toolbar::view(&crate::ui::ribbon::xref_tools())
+            } else if let Some(shown) = self.ribbon.point_cloud_context() {
+                crate::ui::side_toolbar::view_with_active(
+                    &crate::ui::ribbon::point_cloud_tools(),
+                    &move |id| id == "_PCCROPSHOW" && shown,
+                )
             } else if let Some(ctx) = self.ribbon.underlay_context() {
                 let ctx = ctx.clone();
                 crate::ui::side_toolbar::view_with_active(

src/app/view/modal.rs

@@ -29,6 +29,7 @@ impl OpenCADStudio {
                 Some(codec::entities::UnderlayType::Dgn) => crate::t!("Attach DGN Underlay").into_owned(),
                 _ => crate::t!("Attach PDF Underlay").into_owned(),
             },
+            Some(K::PointCloudAttach) => crate::t!("Attach Point Cloud").into_owned(),
             Some(K::UnderlayLayers) => crate::t!("Underlay Layers").into_owned(),
             Some(K::PdfImportSettings) => crate::t!("PDF Import Settings").into_owned(),
             Some(K::PdfImportFile) => crate::t!("Import PDF").into_owned(),
@@ -522,6 +523,12 @@ impl OpenCADStudio {
                     crate::ui::window::pdf_dialogs::view_attach(state, flow)
                 })
             }
+            super::super::ModalKind::PointCloudAttach => {
+                let state = self.point_cloud_attach.as_ref()?;
+                sized_flow(ex, 880, 560, |flow| {
+                    crate::ui::window::pdf_dialogs::view_point_cloud_attach(state, flow)
+                })
+            }
             super::super::ModalKind::UnderlayLayers => {
                 let state = self.underlay_layers.as_ref()?;
                 sized_flow(ex, 460, 520, |flow| {