ATTDEF: Fit/Align attribute text, TEXTSIZE, single-line restart

Align and Fit attributes run their text between the two baseline points,
an ATTDEF height becomes the next text height, and Multiple lines is not
carried to the next definition (measured).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/command_driver/entity_commit.rs

@@ -220,6 +220,12 @@ impl OpenCADStudio {
         // Record where this draw ended so ARC_CONT can continue from it
         // (before `entity` is moved into commit_entity).
         self.update_cont_anchor(&entity);
+        // ATTDEF's height becomes the next text height (TEXTSIZE), as TEXT's does.
+        if let codec::EntityType::AttributeDefinition(attribute) = &entity {
+            if self.tabs[i].active_cmd.as_ref().is_some_and(|cmd| cmd.name().ends_with("ATTDEF")) {
+                self.tabs[i].scene.document.header.text_height = attribute.height;
+            }
+        }
         let label = self.history_label_from_active_cmd(i, "ENTITY");
         let delta_safe = self.delta_add_safe(i, &entity);
         let pending = self.begin_undo(i, label, 1, delta_safe);