Update balance/history optimistically right after a send

On the Electrum backend the post-send rescan is many round-trips, so the balance
lagged a few seconds. Now a successful broadcast immediately applies the tx
locally (applySentTx): drop the spent coins, credit change as pending, add a
pending history row, recompute the balance, and emit — so the UI reflects the
send instantly. The realtime watcher / backstop poll reconciles and fills in the
confirmation once the explorer has indexed it (no immediate rescan, so a
not-yet-indexed tx can't briefly revert the optimistic state). Verified the
balance/utxo/history math.

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

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