Send progressive disclosure, swap context in tx detail, LN amount placeholder

- Send: show only the destination input ('Address or Lightning invoice') until a
  valid on-chain/SP address is entered, then reveal amount + fee rate + coin
  selection + Review. A pasted bolt11 still auto-advances to its own confirmation,
  so those controls never appear for it. New wallet.isOnchainAddress() validator +
  a destReady() gate; recipient onInput/paste re-render only when validity flips.
- History: stop listing swaps at the top. Instead, a send/receive that was part of
  a swap shows its Lightning context (invoice, swap fee, status, refund) on the tx
  detail screen via swaps.findByTxid(). Removed the dead swapListView.
- Lightning receive: drop the '50000' amount placeholder — a bare number looked
  like a value was already entered; the min/max hint below covers it.

Verified in-browser: controls hidden until a valid address, then revealed; LN
receive placeholder empty; no errors.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

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