fix(dropdown): measure selected option with semibold for menu width

[s4mu3lbk]

The menu width is computed from selection paragraphs shaped with the regular font, but the selected option is drawn in semibold, which is wider. With no remaining slack, the selection check then overlaps the selected option's text. Measure the selected option again with the semibold font and take the max, in the overlay menu, the popup menu widget, and the popup positioner size.

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