feat(app): improve payment and paywall UX

src/app/auth/components/auth-panel.tsx

@@ -4,9 +4,9 @@
  */
 import { useRouter } from "next/navigation";
 
+import { BackButton } from "@/app/_components";
 import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
 
-import { AuthBackButton } from "./auth-back-button";
 import { AuthEmailPanel } from "./auth-email-panel";
 import { AuthFacebookPanel } from "./auth-facebook-panel";
 import styles from "./auth-panel.module.css";
@@ -31,7 +31,7 @@ export function AuthPanel() {
 
   return (
     <div className={styles.panelShell}>
-      <AuthBackButton onClick={handleBack} />
+      <BackButton onClick={handleBack} />
 
       {state.authPanelMode === "facebook" ? (
         <AuthFacebookPanel onSwitchToEmail={switchToEmail} />