Closes: BS-3226
Closes: BS-3227
Closes: BS-3228
Closes: BS-3229
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced new view extensions for remote selection, scroll anchoring, slash menu, and toolbar widgets, enhancing customization and integration capabilities.
- **Refactor**
- Updated export paths and module structure for widget-related packages to improve modularity and accessibility.
- Reorganized internal dependencies and removed redundant widget imports from core block packages.
- Refactored edgeless-related widgets and components to use a standardized scope interface for improved context and state management.
- Centralized graphics controller access and slot management through standardized context objects.
- **Chores**
- Added and updated dependencies to streamline extension loading and workspace management.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
