<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Refactor**
- Streamlined and modularized the configuration of editor and theme extensions, introducing a chainable API for extension management.
- Migrated extension setup to use new provider classes and centralized patch logic, improving maintainability and consistency.
- Updated internal extension retrieval processes to use a more explicit, stepwise initialization sequence.
- Removed legacy theme and editor config registration from common views and editor setups.
- Removed direct patch registrations from editor views, consolidating them into extension providers.
- Renamed classes and variables for clarity and consistency across the codebase.
- **New Features**
- Added new extension providers for editor configuration, theme management, and edgeless block header customization, enabling more flexible and validated extension registration.
- Introduced animated viewport focus and dynamic header rendering for edgeless notes and embedded synced documents.
- Integrated reactive editor settings and toolbar configurations with workspace-aware base URL resolution.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
8704c98c7e