<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Refactor**
- Updated and reorganized import paths for transcription block models and types to improve module structure and maintainability.
- **Chores**
- Removed deprecated transcription block schema and related exports from core libraries.
- Registered transcription block schema directly within the workspace schema for improved schema management.
- **Bug Fixes**
- Ensured consistent registration and availability of transcription block features across relevant modules.
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