BAH-4952:Add Hyperlink Property Panel for Label Controls

[Nandinidasari60]

Summary

• Adds hyperlinkUrl input field to control property panel for Label controls
• Implements real-time hyperlink validation with error display
• Adds hyperlinkLabel disabled state management
• Extracts hyperlink constants for maintainability
• Supports backward compatibility with old allowedDomains format
• Updates property panel layout for hyperlink configuration

Behaviour

Scenario	Before	After
Select Label control	No hyperlink property	Hyperlink URL input visible
Enter invalid URL	N/A	Error message shows below input
Enter allowed domain	N/A	URL accepted, no error
Save form with hyperlink	N/A	Form saves with hyperlink property
Load form with hyperlink	N/A	URL populates in property panel

Files Changed

• src/form-builder/components/ControlPropertyPanel.jsx - Add hyperlink input
• src/form-builder/components/Label/HyperlinkUrlInput.jsx - Hyperlink URL input component
• src/form-builder/helpers/propertyValidation.js - URL validation integration
• src/form-builder/constants/hyperlinkConstants.js - Extract constants
• test/form-builder/components/Label/HyperlinkUrlInput.spec.js - Input component tests

Test plan

• Select Label control - verify hyperlink property input appears
• Enter valid domain URL (who.int, usda.gov) - no error
• Enter invalid domain (evil.com) - error message displays
• Try javascript: URL - error message displays
• Save form with hyperlink URL - data persists
• Load saved form - hyperlink URL appears in property panel
• Edit hyperlink URL - changes save correctly
• Clear hyperlink URL - field accepts empty value
• Backward compatibility: old allowedDomains format still works