Count: Invalid Area dialog, table block kept with the table

- When the count area's boundary is gone the approved Invalid Area dialog
  asks: undo the change (also its X and Cancel) or count all of model space;
  "always" keeps the choice in the settings. An edited boundary moves the area.
- A table's *T block is brought up to date whenever the table changes.

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

src/app/update/mod.rs

@@ -8524,6 +8524,10 @@ impl OpenCADStudio {
             }
 
             Message::CloseModal => {
+                // The Invalid Area dialog's ✕ undoes the boundary change, as its Cancel does.
+                if self.active_modal == Some(super::ModalKind::CountInvalidArea) {
+                    return self.update(Message::Count(crate::ui::window::count_palette::CountMsg::InvalidUndo));
+                }
                 if self.active_modal == Some(super::ModalKind::Field) {
                     self.close_field_dialog();
                     return Task::none();