Feature Parity 17: Replace-By-Fee: Speed Up and Cancel Controls

[johnny9]

Summary

Add RBF controls to speed up/cancel eligible transactions.

Complexity

• L

Dependencies

• 16
• 02

Global Constraints

• All implementation lives under gui-qml/.
• No GUI runtime dependency on bitcoin/src/qt components. Reused logic must be moved/ported into gui-qml/.
• Do not change interfaces::Wallet or interfaces::Node in this version.
• Issue completion must satisfy DefinitionOfDone.md.

Scope

• Expose transaction eligibility (transactionCanBeBumped) to activity/details UI.
• Implement bump flow with fee selection and confirmation.
• Support cancel/abandon workflow where applicable.
• Update activity items to track replacement transaction links/status.

Acceptance Criteria (DoD-Aligned)

1. Eligible transaction can be fee-bumped from UI and new txid/status are shown.
2. Ineligible transactions show disabled controls with explanatory reason.
3. Abandon/cancel flow behaves safely and clearly.

Required Tests

• C++ unit tests: Unit tests for bump/abandon adapter logic.
• QML QTest: QTests for button state gating and confirmation dialogs.
• Python E2E (qml/test/testbridge.h): E2E flow for successful bump and failure/ineligible scenarios.

Implementation Notes

• Reuse wallet interface bump methods directly; keep operations async.

[GBKS]

We have design for these features here. Might be good to do a quick evaluation whether those are sufficient before implementation. No problem to make some changes ahead of time if that smoothens development.