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]>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/wallet.js b/src/wallet.js
index 519e3e1..b3e3d40 100644
--- a/src/wallet.js
+++ b/src/wallet.js
@@ -401,6 +401,11 @@ export class Wallet {
     return k ? encodeSilentPaymentAddress(k.scanPub, k.spendPub, { testnet: this.netName !== 'mainnet' }) : null;
   }
 
+  // True if addr is a valid on-chain address for this wallet's network.
+  isOnchainAddress(addr) {
+    try { btc.Address(this.netCfg.net).decode((addr || '').trim()); return true; } catch { return false; }
+  }
+
   // Is SP receiving available here? (we can derive keys AND an indexer is set)
   silentPaymentsAvailable() {
     return !!(this.silentPaymentKeys() && spIndexerUrl(this.netName));