Fix country combo box sizing in tenant wizard

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This page is a capture in the next bucket of the product backlog — a pre-sprint idea, not yet pulled into a sprint as a story.

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The country combo box in the tenant wizard (and possibly other wizard pages) expands to fill the full dialog height, pushing other fields off-screen. The combo's list popup should be bounded to a sensible maximum height (e.g. 300px). Set QComboBox::setMaxVisibleItems or apply a style sheet max-height to the drop-down view.

Emacs 29.1 (Org mode 9.6.6)