Closes: [BS-3438](https://linear.app/affine-design/issue/BS-3438/attachment-embed-view-中的-status-组件)
Closes: [BS-3447](https://linear.app/affine-design/issue/BS-3447/触发-litportal-re-render)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced a visual status indicator for embedded attachments with reload capability.
- Added a new resource status component to display error messages and reload actions.
- **Improvements**
- Enhanced attachment rendering flow with reactive state and unified embed handling.
- Simplified resource state and blob URL lifecycle management.
- Added status visibility flags for PDF and video embeds.
- **Bug Fixes**
- Improved error handling and refresh support for embedded content including PDFs, videos, and audio.
- **Style**
- Added styles for the attachment embed status indicator positioning.
- **Refactor**
- Streamlined attachment and resource controller implementations for better maintainability.
- **Tests**
- Added end-to-end test verifying PDF viewer reload and re-rendering in embed mode.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
b3f0f38b41