feat(review-center): add local pull-request conflict resolution flow
Add a local conflict resolution workflow that allows resolving PR merge conflicts from the review center. The change implements host and repository matching, prepares and merges branches locally, opens the resolve editor, and tracks a multi-phase state machine to continue, abort, or push the resolved branch back to the remote. - Core resolution logic to locate matching repos, prepare merges, and manage phases (preparing → conflicts → ready-to-push → complete). - UI wiring and callbacks to start, reopen, continue, abort, and push local resolutions from the review center. - Helpers to open the conflict editor, monitor merge state, and mark completion after a successful push.
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