test: flush #40 debounce in Container padding seed test (still one undo step)

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

craft/src/panels/right/styles/collapsible.test.tsx

@@ -117,12 +117,14 @@ describe('Container padding is a single control', () => {
       setter.call(top, '20');
       top.dispatchEvent(new Event('input', { bubbles: true }));
     });
+    // number commits are debounced (#40): flush via blur
+    harness.act(() => { top.dispatchEvent(new FocusEvent('blur', { bubbles: true })); top.dispatchEvent(new FocusEvent('focusout', { bubbles: true })); });
     const style = JSON.parse(harness.getSerialized()).sec.props.style;
     expect([style.paddingTop, style.paddingRight, style.paddingBottom, style.paddingLeft]).toEqual(['20px', '0', '40px', '0']);
     expect(style.padding).toBe('');
     harness.act(() => { harness!.actions.history.undo(); });
     expect(JSON.parse(harness.getSerialized()).sec.props.style.padding).toBe('40px 0');
-    expect(harness.query.history.canUndo()).toBe(false);
+    expect(harness.query.history.canUndo()).toBe(false); // exactly one undo step
   });
 });