chore: drop brand names and orphaned PICK_HIGHLIGHT colours

Neutralise vendor references in comments to plain behavioural descriptions
(object acquisition / object snap). Remove the PICK_HIGHLIGHT and
PICK_HIGHLIGHT_DIM wire colours: their only consumer was the stripped
storm-sewer add-on, and the retained plugin acquisition pathway draws the
ObjectPick snap glyph and per-command hover previews instead, so the
constants are dead.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/update.rs

@@ -2780,7 +2780,7 @@ impl OpenCADStudio {
                     let wo_f = glam::Vec3::new(wo_local[0] as f32, wo_local[1] as f32, wo_local[2] as f32);
                     let effective_wcs = effective + wo_f;
 
-                    // C3D-style orange object snap (plugin commands implement resolve_object_pick).
+                    // Orange object snap (plugin commands implement resolve_object_pick).
                     if needs_structure {
                         use crate::snap::{SnapResult, SnapType};
                         let pick = self.tabs[i].active_cmd.as_ref().and_then(|c| {

src/command/mod.rs

@@ -11,7 +11,7 @@ use crate::scene::Scene;
 use acadrust::{EntityType, Handle};
 use glam::Vec3;
 
-/// Domain object resolved under the cursor for C3D-style ObjectPick snapping.
+/// Domain object resolved under the cursor for ObjectPick snapping.
 #[derive(Clone, Copy, Debug)]
 pub struct ObjectPickHit {
     pub handle: Handle,
@@ -473,7 +473,7 @@ pub trait CadCommand: Send {
         None
     }
 
-    /// Hover label for C3D-style object acquisition (e.g. "Inlet" under cursor).
+    /// Hover label for object acquisition (e.g. "Inlet" under cursor).
     fn set_acquisition_hint(&mut self, _hint: Option<&str>) {}
 
     /// Called after `CmdResult::ReplaceEntity` is applied to the document.

src/scene/mod.rs

@@ -145,8 +145,8 @@ pub fn build_derived_caches(doc: &CadDocument) -> DerivedCaches {
     // Header `$EXTMIN`/`$EXTMAX` is the fast path, but it's untrustworthy:
     // the sentinel (1e20 / -1e20) when the writer never computed extents,
     // stale values when a drawing was edited and extents weren't refreshed,
-    // and Civil-3D-style top-level extents that span only an Insert's
-    // bounding box rather than the actual MSPACE geometry. Any of those
+    // and top-level extents that span only an Insert's bounding box rather
+    // than the actual MSPACE geometry. Any of those
     // leave the precision-preserving offset wrong, so direct MSPACE
     // entities render at huge magnitudes and f32 wires lose precision.
     //

src/scene/model/wire_model.rs

@@ -79,11 +79,6 @@ impl WireModel {
     pub const WHITE: [f32; 4] = [1.00, 1.00, 1.00, 1.0];
     pub const CYAN: [f32; 4] = [0.25, 0.85, 1.00, 1.0];
     pub const SELECTED: [f32; 4] = [0.15, 0.55, 1.00, 1.0];
-    /// Object-acquisition highlight (structure / catchment hover); not yet wired.
-    #[allow(dead_code)]
-    pub const PICK_HIGHLIGHT: [f32; 4] = [0.95, 0.50, 0.08, 1.0];
-    #[allow(dead_code)]
-    pub const PICK_HIGHLIGHT_DIM: [f32; 4] = [0.95, 0.50, 0.08, 0.45];
     /// Sentinel AABB that never rejects any snap query.
     pub const UNBOUNDED_AABB: [f32; 4] = [
         f32::NEG_INFINITY,

src/snap/mod.rs

@@ -31,7 +31,7 @@ pub enum SnapType {
     ApparentIntersection,
     Parallel,
     Grid,
-    /// C3D-style object acquisition (storm structure / network pick) — orange marker.
+    /// Object acquisition (domain-object pick, e.g. network structure) — orange marker.
     ObjectPick,
 }
 

src/ui/overlay.rs

@@ -501,7 +501,7 @@ impl canvas::Program<Message> for SelectionCanvas {
         // ── Snap marker ───────────────────────────────────────────────────
         if let Some((sp, snap_type)) = self.snap {
             let (r, g, b) = if snap_type == SnapType::ObjectPick {
-                (0.95_f32, 0.50, 0.08) // C3D-style orange object snap
+                (0.95_f32, 0.50, 0.08) // orange object-snap marker
             } else {
                 (1.0, 0.9, 0.1) // classic yellow OSNAP
             };
@@ -513,7 +513,7 @@ impl canvas::Program<Message> for SelectionCanvas {
             };
             match snap_type {
                 SnapType::ObjectPick => {
-                    // Target box + center dot (Civil 3D acquisition glyph).
+                    // Target box + center dot (object-acquisition glyph).
                     let h = 7.0_f32;
                     let rect = canvas::Path::rectangle(
                         Point::new(sp.x - h, sp.y - h),