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- test_deck_stack_exists: _deck_stack present; default shows _control_deck. - test_pinning_two_panels_switches_to_split: pin 2 panels + refresh → stack shows _deck_split_container. Pin via _pinned flags directly (not the toggle handler) so no QSettings write leaks into other function-scoped windows; existing 6 tests run in default/tabbed state and still pass. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>