### TL;DR
feat: optimize workspace attachment uploading & error display
### What Changes
####
Support for Workspace Attachment Uploading & Error Handling
* Added support for three attachment states: uploading (local), upload failed (local error), and uploaded (persisted). The frontend UI now displays real-time upload progress and error messages.
* Attachments that fail to upload can be deleted directly without confirmation.
* Merged display of uploading and uploaded attachments for a smoother user experience.
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Attachments now show real-time upload status including uploading, error, and uploaded states.
- Users can remove failed (error) attachments instantly without confirmation.
- Attachment list merges uploading and uploaded files, displaying up to 10 items.
- **Bug Fixes**
- Improved error handling and messaging for failed attachment uploads.
- **Style**
- Enhanced visual styling for error attachments with distinct colors and backgrounds.
- **Tests**
- Added tests simulating slow network uploads, upload failures, and direct removal of error attachments.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
### TL;DR
refactor: rename settings, indexer embedding -> embedding
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Refactor**
- Unified naming in workspace settings from "Indexer & Embedding" to "Embedding" for improved clarity.
- Updated sidebar labels, tab keys, and test IDs to reflect the new naming convention.
- Streamlined the layout and organization of the embedding settings interface for a more consistent user experience.
- Simplified the export and component structure for embedding settings.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
### TL;DR
tests: workspace embedding e2e
> CLOSE BS-3052
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced comprehensive end-to-end tests for workspace embedding settings, including toggling embedding, uploading and managing attachments, pagination, and ignoring documents.
- Added utilities for automated interaction with the settings panel and document creation in tests.
- **Tests**
- Implemented detailed scenarios to verify workspace embedding functionality and user interactions within the settings panel.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
