Feature Parity 15: Address Book and Contacts Management

[johnny9]

Summary

Deliver address book and contacts CRUD with send/receive integration.

Complexity

• XL

Dependencies

• 10
• 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

• Create address/contacts list model using wallet address APIs.
• Add add/edit/delete contact flows with purpose tags where relevant.
• Integrate contact selection into send and receive flows.
• Support search/filter and duplicate validation.

Acceptance Criteria (DoD-Aligned)

1. User can create, edit, delete contacts and see updates reflected in send/receive views.
2. Invalid addresses and duplicate entries are blocked with clear messages.
3. Contact labels flow through activity/history where applicable.

Required Tests

• C++ unit tests: Unit tests for contact model CRUD and validation.
• QML QTest: QTests for contact form and list interactions.
• Python E2E (qml/test/testbridge.h): E2E flow: add contact -> send using contact -> verify label propagation.

Implementation Notes

• Keep model and UI fully inside gui-qml.