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/commands/layerprops.rs

@@ -128,6 +128,10 @@ impl OpenCADStudio {
                                 l.color = acadrust::types::Color::from_index(idx);
                                 self.push_undo_snapshot(i, "LAYER COLOR");
                                 self.tabs[i].dirty = true;
+                                // By-layer colour is baked into every wire on
+                                // this layer — re-tessellate so they repaint
+                                // immediately (issue #231 class).
+                                self.tabs[i].scene.bump_geometry();
                                 self.command_line.push_output(&format!(
                                     "LAYER: '{}' color set to ACI {}.",
                                     layer_name, idx

src/app/commands/styleprops.rs

@@ -413,6 +413,11 @@ impl OpenCADStudio {
                             if changed > 0 {
                                 self.push_undo_snapshot(i, "CHPROP");
                                 self.tabs[i].dirty = true;
+                                // Colour / linetype / ltscale / transparency /
+                                // layer are baked into the cached wire geometry —
+                                // re-tessellate the changed entities so they
+                                // repaint immediately (issue #231 class).
+                                self.invalidate_property_targets(i, &handles);
                                 self.command_line.push_output(&format!(
                                     "CHPROP: {} entity/entities updated.",
                                     changed