Added FontAwesome icons to options pages and sidebar for better visual distinction. Improved the options index page with overview cards for each settings category. Updated CSS for active and hover states in the options sidebar, providing a more modern and user-friendly interface. Added a subscription management link to the header if configured.
Introduces open registration settings in the options area, allowing administrators to enable or disable public user signup. Adds a registration options page, updates sidebar navigation, and implements a public signup form and controller logic. Also refines user model to ensure correct data types for user fields and updates language strings for registration. The login page now links to signup when open registration is enabled.