Set anti-fee-sniping locktime on bitcoin sends#3362
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Tip + ~10% backdate (Core DiscourageFeeSniping) via shared helper, wired into normal sends (path A) and payjoin/PSBT (path B). 0 when unsynced.
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Cake sets nLockTime = 0 on all BTC txs, no anti-fee-sniping and a fingerprint that diverges from Core/Electrum (payjoins especially).
adds a shared
antiFeeSnipingLocktimehelper replicating Core'sDiscourageFeeSniping(tip; ~10% backdate by rand(0..99); 0 if unsynced), wired into both locktime-defaulting paths:BitcoinTransactionBuilder(normal sends) andPSBTTransactionBuild/PsbtV2viasetGlobalFallbackLocktime(payjoin originalPsbt).closes #3361