- Redesigned the Admin panel with a new sidebar-based layout for streamlined management

- Organized Admin functionality into dedicated tabs: GENERAL, CHALLENGES, BLOG, PLAYERS, and TOOLS
- Integrated "Backup & Restore" and "Danger Zone" into the new Admin TOOLS section
- Fixed page title clipping by adding right-padding to the navigation bar's dynamic title
- Updated Authentication UI: Renamed "New user?" to "NEW PLAYER?", capitalized registration labels, and added "PLAYER ALREADY?" navigation

App.tsx

@@ -113,7 +113,7 @@ const LayoutShell: React.FC = () => {
           <div className="flex justify-center text-center">
             <div className="flex items-center gap-3 text-white">
               {pageTitle.icon && <div className="text-[#bf00ff]">{pageTitle.icon}</div>}
-              <span className="text-3xl font-black italic uppercase tracking-tighter truncate">
+              <span className="text-3xl font-black italic uppercase tracking-tighter truncate pr-1">
                 {pageTitle.text}
               </span>
             </div>