Point clouds: POINTCLOUDMANAGER palette

A dockable Point Cloud Manager lists each point cloud of the drawing (only
the selected ones while any is selected) with Regions (disabled, region
data is not read), Unassigned Points and Scans, the scans named by their
file stems. Each switch shows or hides points: the cloud, its unassigned
points, all scans or one scan. The hidden set is the cloud's
OCS_POINTCLOUD_VISIBILITY extended data (scan names plus *CLOUD_OFF /
*UNASSIGNED_OFF markers, app id registered), written as one undo step and
kept on save. The drawn points skip hidden scans by their index ranges,
and the hidden set is part of the placed-cloud key. Collapse all / expand
all, row highlight and a search box that filters rows (keeping parents of
matches). POINTCLOUDMANAGERCLOSE closes it; the pc_manager_toggle
automation action flips a switch.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/app/control/actions.rs

@@ -71,6 +71,7 @@ pub(super) const NAMES: &[&str] = &[
     "close_modal",
     "pdf_dialog_ok",
     "pdf_layer_toggle",
+    "pc_manager_toggle",
     "pdf_page_select",
     "ribbon_tab",
     "ribbon_dropdown",
@@ -688,6 +689,19 @@ impl OpenCADStudio {
             "pdf_layer_toggle" => Message::PdfDialog(
                 crate::ui::window::pdf_dialogs::PdfDialogMsg::LayersToggle(string(req, "value")?.into()),
             ),
+            // Point Cloud Manager: flip a row's switch, "<handle>:<row>" with
+            // row cloud, unassigned, scans or scan:<name>.
+            "pc_manager_toggle" => {
+                use crate::ui::window::pc_manager::{PcManagerMsg, Row};
+                let value = string(req, "value")?;
+                let parsed = value.split_once(':').and_then(|(handle, row)| {
+                    Some((codec::Handle::new(u64::from_str_radix(handle, 16).ok()?), Row::parse(row)?))
+                });
+                let Some((handle, row)) = parsed else {
+                    return Err(failure("bad_value", "Expected <handle>:<row>"));
+                };
+                Message::PcManager(PcManagerMsg::Toggle(handle, row))
+            }
             // Attach dialog: choose pages by index ("0,2").
             "pdf_page_select" => {
                 let pages: Vec<usize> = string(req, "value")?