A `WantedMenu` badge dropdown on the agents table clips against
`.ui-table-scroll`s overflow the moment its row is the last (or
near-last) one — the popover extends past the table content the
scroll container bounds itself to. `Table.tsx` already solved the
identical clip for its own column-filter popover with a
position:fixed + portal computed from the anchor rect; `Dropdown` now
takes an optional `portal` prop that opts a caller into that same
recipe instead of a second hand-rolled copy of it. Off by default —
every other current caller (StatusChips x2, the components-page demo)
keeps its existing non-portal behavior unchanged.
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