Tracking issue for Wikibase Schema Editor

[DaxServer]

• Requirements: docs: add kiro spec requirements for Wikibase Schema Editor #63
• Design: docs: add kiro design spec for Wikibase Schema Editor #64
• Implementation Plan: docs: add kiro tasks for Wikibase Schema Editor spec #65

• 1. Set up core TypeScript interfaces and types
• 2. Create drag-and-drop context types and utilities
• 3. Build validation error handling system
• 4. Create basic schema store with TDD
• 5. Build API integration composable
• 6. Create drag-and-drop composable
• 7. Build ColumnPalette component with TDD
• 8. Create column data type indicators
• 9. Build basic WikibaseSchemaEditor container
• 10. Create ItemEditor component foundation
• 11. Build TermsEditor component with TDD
• 12. Add language selection for Terms
• 13. Create column mapping for Terms
• 14. Build StatementsEditor container
• 15. Create statement hierarchical display
• 16. Build property selection interface
• 17. Create StatementEditor value mapping
• 18. Add data type validation for statements
• 19. Build statement rank selection
• 20. Create QualifiersEditor component
• 21. Build qualifier value mapping
• 22. Add qualifier nested display
• 23. Create ReferencesEditor component
• 24. Build reference value mapping
• 25. Add reference citation display
• 26. Implement real-time validation
• 27. Create schema completeness validation
• 28. Integrate schema persistence
• 29. Build SchemaSelector component
• 30. Add schema metadata display
• 31. Implement schema selection workflow
• 32. Integrate schema deletion into schema selection workflow
• 33. Refactor validation terminology and workflow
• 34. Implement autosave functionality in schema store