### What problem does this PR solve?
Fix: Optimized the style and functionality of multiple components #3221
- Modified the SkeletonCard component, adding a className attribute and
adjusting the style
- Updated the RAGFlowSelect component, adding a disabled attribute
- Adjusted the style of the Tooltip component
- Optimized the layout of the RetrievalTesting and TestingResult pages
- Updated the style and loading status display of NextSearch-related
pages
- Removed unnecessary logs from the Spotlight component
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
feat(next-search): Implements document preview functionality
- Adds a new document preview modal component
- Implements document preview page logic
- Adds document preview-related hooks
- Optimizes document preview rendering logic
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Feat: New search page components and features #3221
- Added search homepage, search settings, and ongoing search components
- Implemented features such as search app list, creating search apps,
and deleting search apps
- Optimized the multi-select component, adding disabled state and suffix
display
- Adjusted navigation hooks to support search page navigation
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
