Repository navigation
Added Blazor ModalDialog component
Implemented Modal component with basic modal dialog functionality:
- Native HTML5 Dialog - Built on element for built-in accessibility, focus trapping, and backdrop support
- Customizable Header - Title and optional summary text
- Flexible Content - Render any Blazor content in the modal body
- Configurable Buttons - Show/hide Cancel and Submit buttons with custom text
- Size Variants - Small, Medium (default), Large, ExtraLarge
- Position Variants - Top, Center (default), Bottom of viewport
- Event Callbacks - OnClose and OnSubmit for handling user actions
- Keyboard Support - Native Escape key to close