Update the ImageComponent GraphQL fragment to include the new layerType field for distinguishing base image layers from application layers.

Implementation Details:

• Add layerType field to ImageComponentVulnerabilities GraphQL fragment
• Update TypeScript types to include layerType: 'APPLICATION' | 'BASE_IMAGE'
• Verify field is returned in API responses
• Update any interfaces/types that reference ImageComponent

Acceptance Criteria:

• GraphQL query includes layerType field
• Type definitions updated with proper union type
• No breaking changes to existing queries
• Field is properly typed and available throughout the component tree