- Added full CRUD operations to agent configuration dialog knowledge base section
- Replaced simplified agent-kb-tree with full-featured agent-knowledge-base-manager
- Created unified KB entry modal merging file upload and text entry modals
- Enhanced folder selection UX with inline folder creation capability
- Integrated standard FileRenderer for consistent file preview across app
- Removed outdated backend/core/knowledge_base/ system causing table reference errors
- Moved FileProcessor to correct location in backend/knowledge_base/
- Extracted reusable KnowledgeBaseManager component to eliminate code duplication
- Updated agent KB tree to use assignment system instead of old table structure
- Simplified file preview modal to focus on summary editing instead of broken file preview
- Added proper loading states and error handling throughout
- Removed unused legacy components and hooks
- Updated all imports to use correct table structure (knowledge_base_folders/entries)
- Fixed API routes to work with new assignment-based system