fix(matchprop): match text style and height between TEXT/MTEXT objects (#361)

MATCHPROP only copied the generic properties (layer, color, linetype,
linetype scale, lineweight), so matching text to text left the
destination's style and height unchanged. Copy the source's text style
and height to TEXT and MTEXT destinations, in both directions, like
AutoCAD's "Text" special property.

Adds an in-process regression test that drives the real interactive
command path (source pick -> destination selection) and fails on the
old code with the reported symptom.

Fixes #361

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/app/command_driver.rs

@@ -759,6 +759,19 @@ impl OpenCADStudio {
                         c.line_weight,
                     )
                 });
+                // Text-specific properties travel between text-like objects
+                // (TEXT ↔ MTEXT, both directions), like AutoCAD's "Text"
+                // special property (#361).
+                let text_props =
+                    self.tabs[i]
+                        .scene
+                        .document
+                        .get_entity(src)
+                        .and_then(|e| match e {
+                            acadrust::EntityType::Text(t) => Some((t.style.clone(), t.height)),
+                            acadrust::EntityType::MText(m) => Some((m.style.clone(), m.height)),
+                            _ => None,
+                        });
 
                 if let Some((layer, color, linetype, lt_scale, lw)) = props {
                     self.push_undo_snapshot(i, "MATCHPROP");
@@ -769,6 +782,19 @@ impl OpenCADStudio {
                             crate::scene::view::dispatch::apply_line_weight(e, lw);
                             e.common_mut().linetype = linetype.clone();
                             e.common_mut().linetype_scale = lt_scale;
+                            if let Some((style, height)) = &text_props {
+                                match e {
+                                    acadrust::EntityType::Text(t) => {
+                                        t.style = style.clone();
+                                        t.height = *height;
+                                    }
+                                    acadrust::EntityType::MText(m) => {
+                                        m.style = style.clone();
+                                        m.height = *height;
+                                    }
+                                    _ => {}
+                                }
+                            }
                         }
                     }
                     self.tabs[i].dirty = true;