Add ln send spend state

AcidBunny21requested to merge
add-ln-send-spend-state into master
  • check or remove this line after you've added a CHANGELOG entry or if your PR doesn't need one (they should go into CHANGELOG/unreleased/)

Summary by CodeRabbit

  • New Features

    • Improved Lightning payment handling to track HTLC-send VTXOs through payment attempts, including a new persisted spend state for Lightning-spent outputs.
    • Extended client responses to treat the new Lightning-spent state as “spent” consistently.

  • Chores

    • Added database support for linking payment attempts to HTLC-send VTXOs and introduced the new spend-state enum value.
    • Refactored internal payment-attempt processing to use a unified handler for status transitions.

  • Tests

    • Updated Lightning payment attempt tests to match the revised persistence inputs.
Edited by coderabbit

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