fix duplicate HTLC fail-back on stale force-close #1
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This PR addresses the duplicate HTLC fail-back on stale force-close that fail-back one of them and waits till timeout to fail-back everything. This change adds proper tracking of HTLCs by payment hash to ensure all identical HTLCs are failed back immediately when detected, rather than waiting for timeout.
Also introduces a functional test that demonstrates the scenario by creating two identical HTLCs, performing a stale force-close, and verifying both HTLCs are failed back correctly.
Fixes