<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Retry failed Copilot transcription tasks in real time.
* Retried tasks resume processing and report updated status.
* Managed Copilot provider models can be omitted to use provider
defaults.
* **Bug Fixes**
* Improved handling of incomplete BYOK profiles, including safe
replacement of legacy records.
* Duplicate profile creation now returns a clear validation error.
* Improved transcript processing reliability by preventing duplicate or
stale dispatches.
* **Migration**
* Consolidated legacy managed-provider settings while preserving
existing profiles and defaults.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
06b3d020fa