fix(properties): repaint on linetype/lineweight/layer edits (#231 class)

Color/linetype/lineweight/layer are baked into the cached wire geometry
at tessellation time, so a property edit only repaints if the handler
bumps the geometry epoch. The color path did; several siblings only set
tabs.dirty (a save flag) and never re-tessellated, leaving the viewport
showing the stale look.

Route every handle-based edit through invalidate_property_targets
(mark dirty + recolor meshes + bump geometry), and full-bump the
name-based LAYER COLOR change:

- ribbon layer / linetype / lineweight dropdowns applied to a selection
- CHPROP (color/linetype/ltscale/transparency/layer)
- LAYMATCH (MatchEntityLayer)
- LAYER COLOR <name> <aci>

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

src/app/update/mod.rs

@@ -1971,11 +1971,15 @@ impl OpenCADStudio {
                     self.ribbon.active_lineweight = lw;
                 } else {
                     self.push_undo_snapshot(i, "CHPROP");
-                    for handle in handles {
+                    for &handle in &handles {
                         if let Some(entity) = self.tabs[i].scene.document.get_entity_mut(handle) {
                             crate::scene::view::dispatch::apply_line_weight(entity, lw);
                         }
                     }
+                    // Lineweight is baked into the cached wire geometry —
+                    // re-tessellate so the change shows immediately (issue #231
+                    // class).
+                    self.invalidate_property_targets(i, &handles);
                     self.tabs[i].dirty = true;
                     self.ribbon.active_lineweight = lw;
                     self.refresh_properties();