Fix stale cross-device balance + Electrum call timeouts

Two Electrum-backend issues:

1. Stale balance after a send made on another device: _reconcileHeld set each
   address's balance from get_balance/address-stats, where a confirmed coin being
   spent by an unconfirmed tx STILL counts as confirmed (with a compensating
   negative unconfirmed). So a device that didn't make the send kept showing the
   spent coin's value. Now the entry balance is derived from the actual unspent
   set (listunspent, which excludes spent coins) — verified a spent coin clears.

2. Per-address rescan failing with 'electrum timeout: blockchain.scripthash.
   get_balance': public Electrum servers can drop a response or the socket can
   flap mid-call. _rpcCall now retries a couple of times on a fresh id (12s each)
   before giving up.

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

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