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/command_driver.rs

@@ -688,6 +688,10 @@ impl OpenCADStudio {
                             e.as_entity_mut().set_layer(layer.clone());
                         }
                     }
+                    // New layer changes the baked by-layer colour/linetype/
+                    // lineweight — re-tessellate the moved entities so they
+                    // repaint immediately (issue #231 class).
+                    self.invalidate_property_targets(i, &dest);
                     self.tabs[i].dirty = true;
                     self.command_line
                         .push_info(&format!("Layer matched to \"{layer}\"."));