fix: prevent false on-chain send success

[ovitrif]

Refs #717

Description

• Propagate accepted-only on-chain send results from LDK Node to the existing success flow.
• Preserve rejected, failed, timed-out, and not-dispatched outcomes as errors so they cannot reach Bitcoin Sent.
• Adapt the app's NodeError mapping to rc.67's typed error contract and retain the transaction id in safe diagnostics.
• Cover amount and maximum sends, accepted results, all four broadcast outcomes, and wrapped error classification.

Dependency

• Blocks on synonymdev/ldk-node#113, head 505b1a6, stacked on feat: LNURL withdraw #115.
• Requires the unpublished 0.7.0-rc.67 Swift artifact. Local validation used its verified artifact; no release has been created.

Preview

717-current-artifact-accepted.mp4

717-current-artifact-rejected.mp4

QA Notes

• Current head 1ddd21e rebased on 215a9f10.
• git diff --check passes.
• Focused OnchainSendResultTests passed 7/7 against the verified unpublished 0.7.0-rc.67 artifact.
• Current-artifact consumer build and isolated simulator flow passed with the local-only E2E_ELECTRUM_URL=tcp://127.0.0.1:62001 fixture override; no source override was committed.
• Marketplace regtest corroborated the 1,000 sat send as transaction 158bdd1c2b81413b451f16b3331d261086daa73d03869e7a72099e5e83c6b04c, confirmed in block 00941d326f26ccedfec7305849c0c176442a9e3c1509dc2c0b9a934768d5fc5b.
• Rejected current-artifact path remains user-visible as Transaction Failed for the recorded non-final backend rejection.