Implement a modal dialog for creating new instances with comprehensive form fields for different authentication methods (token/OIDC). Includes form validation, loading states, and success/error handling. Also adds consistent card styling across views and updates the add user button with an icon.
Add api-backend.md to gitignore to prevent accidental commits of local documentation.
Extract duplicated styles across multiple components into a common CSS file and import it where needed. This improves maintainability by reducing code duplication and centralizing style definitions.
Add Font Awesome dependency and replace all emoji icons with corresponding Font Awesome icons across components. This provides better visual consistency and scalability.
