test: the worksheet check tears its pages down before their profile

Intermittently it segfaulted after every check had passed, leaving
teardown order to Python; a profile released under a live page does
that. Eight runs clean afterwards. The real Wonder Ink, closed six times
by its window's close button in the lab, exited 0 each time.

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

tools/lab/pdf-check

@@ -135,5 +135,23 @@ check("and the window will open exactly that path", window.may_open(spaces))
 
 print()
 print(f"{passed} passed, {failed} failed")
+
+# Pages go before their profile. Left to Python's own teardown the order
+# is arbitrary, and a profile released while a page still uses it is a
+# segfault on the way out — measured, intermittently, AFTER every check
+# had passed, which made a passing run report failure. The real Wonder
+# Ink was closed six times in the same lab and exited 0 each time.
+from PyQt6.QtCore import QCoreApplication, QEvent
+
+for index in range(window._tabs.count()):
+    view = window._tabs.widget(index)
+    view.page().deleteLater()
+    view.deleteLater()
+window.close()
+window.deleteLater()
+QCoreApplication.sendPostedEvents(None, QEvent.Type.DeferredDelete.value)
+profile.deleteLater()
+QCoreApplication.sendPostedEvents(None, QEvent.Type.DeferredDelete.value)
+sys.stdout.flush()
 sys.exit(1 if failed else 0)
 PY