ATTDEF: dialog, -ATTDEF prompts, tag display, Properties and ribbon

Attribute Definition dialog and Edit Attribute Definition dialog, -ATTDEF
with the reference prompts and modes (AFLAGS), tag shown in the drawing,
justification-aware grips, reworked Properties with validation, Home Block
slide-out and Insert Block Definition panel, and the codec patch for
ATTDEF DXF output and the R2013+ solid wire cache.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/app/update/command.rs

@@ -3627,6 +3627,14 @@ pub(super) fn on_tab_close(&mut self, idx: usize) -> Task<Message> {
                                 return Task::none();
                             }
                         }
+                        if field.starts_with("att_") {
+                            if let Err(message) =
+                                crate::entities::attribute::validate_definition_property(field, &val)
+                            {
+                                self.command_line.push_error(message);
+                                return Task::none();
+                            }
+                        }
                         if field.starts_with("ul_") {
                             if let Err(message) =
                                 crate::entities::underlay::validate_property(field, &val)