fix: correct spelling in warning text of AuthDialog component

Author: atyrode

src/frontend/src/ui/AuthDialog.tsx

@@ -15,7 +15,7 @@ interface AuthDialogProps {
 
 export const AuthDialog = ({
   description = <>Welcome to your <strong className="highlight">whiteboard IDE</strong>. <br /><br /> Open <strong className="highlight">terminals</strong>, <strong className="highlight">VSCode</strong>, or <strong className="highlight">Cursor</strong> in your pad, and start coding right away.</>,
-  warningText = <>This is a open-source project in beta.<br /> Backup your work!</>,
+  warningText = <>This is an open-source project in beta.<br /> Back up your work!</>,
   onClose,
   children,
 }: AuthDialogProps) => {