fix(listview): normalize select option + match AntD dropdown styles

Normalize selected option to plain {label: string, value} before passing
to onSelect — matches original SelectFilter behaviour and prevents
'Converting circular structure to JSON' when emotion-styled ReactNode
labels are serialized to URL query params.

Style OptionItem to match AntD Select dropdown exactly: colorBgElevated
container, fontSize (not fontSizeSM), colorText always (not colorPrimary
on selected), colorFillTertiary hover, borderRadiusSM on items, 32px
height with sizeUnit padding.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>