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 <[email protected]>

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,