Extract all MCP form validation logic into a reusable custom hook to
improve code organization and enable reuse across components.
Changes:
- Create useMcpValidation hook with 4 validation functions:
* validateJson: basic JSON structure validation
* formatTomlError: unified TOML error formatting with i18n
* validateTomlConfig: complete TOML validation with required fields
* validateJsonConfig: complete JSON validation with structure checks
- Update McpFormModal to use the hook instead of inline validation
- Simplify validation calls throughout the component
- Reduce code duplication while maintaining all functionality
Benefits:
- Validation logic can be reused in other MCP-related components
- Easier to test validation in isolation
- Better separation of concerns
- McpFormModal remains at 699 lines (original: 767), kept cohesive
The component stays as one piece since its 700 lines represent a
single, cohesive form feature rather than multiple unrelated concerns.
