Entity Actions: Create dedicated delete modal and prevent deletion of non-deletable items.

[engijlr]

Summary

• Added support for isDeletable check in delete modals to prevent deletion of system items
• Created a dedicated delete modal (entity-delete-modal) for the base delete action
• Updated deleteWithRelation modal to also respect isDeletable flag
• When isDeletable === false, users see an informative message and can only close the modal

Changes

Core Package

• New: entity-delete-modal.element.ts - Base delete modal with isDeletable support
• New: entity-delete-modal.token.ts - Modal token and data interface
• New: modal/manifests.ts - Modal manifest registration
• New: modal/constants.ts - Exports
• Updated: delete.action.ts - Now uses the new dedicated modal instead of generic confirm modal

Relations Package

• Updated: delete-with-relation-modal.element.ts - Added isDeletable check, hides relations info when item cannot be deleted

Data Type Package

• Updated: data-type-item.server.data-source.ts - Maps isDeletable from API response
• Updated: types.ts - Added isDeletable to item type

Localization

• Updated: en.ts, es.ts - Added cannotDeleteSystemItem message

Test plan

• Navigate to Settings > Data Types
• Try to delete a system data type (e.g., "List View - Content")
• Verify modal shows "This item is used by the system and cannot be deleted."
• Verify only "Close" button is shown (no Delete button)
• Try to delete a custom (user-created) data type
• Verify normal delete confirmation is shown with Cancel/Delete buttons

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