Correct Particl transaction serialization and signing#1268

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sneurlax wants to merge 8 commits intostagingfrom

Commits on Mar 3, 2026

fix: Particl wallet P2PKH signing and checkBlockUTXO cast
sneurlax
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feat: update cypherstack/bitcoindart to point to fix/particl off master
sneurlax
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Commits on Mar 24, 2026

fix(particl): override bitcoindart in order to resolve dependency issue
sneurlax
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docs: update docs re: new lld dep since flutter 3.38
sneurlax
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