Enhance guest management features in GuestListTable

Added functionality for adding, editing, deleting, and copying guests' details, along with filtering, exporting, and sending invitations. Improved user interactions with dialog handling and introduced error handling for better usability. Integrated GuestsList into the event detail page.

frontend/src/providers/index.tsx

@@ -6,6 +6,7 @@ import { ReactQueryDevtools } from "@tanstack/react-query-devtools";
 import { AuthProvider } from "@/context/auth-context";
 import { ThemeProvider } from "next-themes";
 import { DataProviders } from "@/providers/data";
+import { Toaster } from "sonner";
 
 // Create a client
 const queryClient = new QueryClient({
@@ -29,6 +30,7 @@ export function Providers({ children }: { children: React.ReactNode }) {
       >
         <AuthProvider>
           <DataProviders>{children}</DataProviders>
+          <Toaster />
         </AuthProvider>
       </ThemeProvider>
       <ReactQueryDevtools initialIsOpen={false} />