[ FIX ] Fix bugs for #1837 and enable feePayer again#1981

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posaune0423 wants to merge 2 commits intodrift-labs:masterfrom

posaune0423:fix/payer-signing-prob

Commits on Oct 23, 2025

feat(tx-sender-test.ts): add transaction sender tests for RetryTxSender and WhileValidTxSender to ensure correct fee payer assignment and transaction handling
posaune0423
committed
fix(driftClient.ts): add missing newline at end of file for consistency
posaune0423
committed