Wallet: don't understate 'amount sent' for multi-input/swap-funding txs

_txSummary computed a tx's spend only from inputs whose prevout address is on the
scanned frontier (addrMap). A coin spent from an address not currently in that
set — e.g. a fresh reverse-swap claim — was dropped from the total, so the net
showed e.g. -4,768 instead of -50,794, and the scan overwrote applySentTx's
correct net with it. Now: applySentTx counts every input it spent (falling back
to the witness-utxo value if a coin was dropped from the utxo set) and marks the
tx 'local'; the rescan preserves a local tx's net/fee instead of recomputing.
Funds were always correct on-chain — this was a display-only undercount.

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

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