Consolidate ark exit into one page: cooperative + unilateral

The cooperative offboard was buried under the receive-tab board form
and the unilateral exit lived in Settings — both unintuitive. Now a
small 'Exit' link next to the Ark balance opens a dedicated page that
explains and offers both: cooperative (server co-signs, fast, no
on-chain funds needed, small server fee) and unilateral (trustless,
timelocked, pays mining fees). In-flight exit progress (hop counter,
timelock countdown, cancel) moved here from Settings; the receive pane
loses the offboard button and Settings loses the exit button.

Co-Authored-By: Claude Fable 5 <[email protected]>

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