Renewing asks first, and a renewal links to its round's transaction

- The coins page's Renew button opens a confirmation instead of renewing
  at once: how many coins, their amount, the fee, and what is left to
  spend meanwhile — with a red notice when that is nothing (the button
  selects every coin by default, which is how a user locked their whole
  balance for an hour on 2026-10-03). It says the coins can't be spent
  until the round's transaction confirms and that a renewal can't be
  cancelled; the wallet renews for free near expiry anyway. The inline
  notice from 328f2db moves into it.
- A renewal keeps its round's transaction id as soon as the round has
  run (before it confirms): the in-progress card on the coins page links
  to it, and the finished renewal's history row carries it, so its
  detail shows the id with View/Copy like any on-chain movement.
  Renewals finished before this change have no id recorded.

tools/ark/renew-confirm-ui-test.js, tools/ark/renew-txid-test.js

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01ULQZS9MQa6iAsXnrJUD9Du

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