perf: defer heavy modules and add performance baselines

Lazy-load Stripe and the chat reply animation, remove the unused Lottie runtime, and add repeatable bundle and Web Vitals baseline tooling.

src/app/tip/tip-checkout-button.tsx

@@ -8,7 +8,7 @@ import {
 } from "@/stores/payment/payment-context";
 import { Logger } from "@/utils";
 
-import { StripePaymentDialog } from "../subscription/components/stripe-payment-dialog";
+import { LazyStripePaymentDialog } from "../subscription/components/lazy-stripe-payment-dialog";
 import { stripePaymentDialogStyles as dialogStyles } from "../subscription/components/stripe-payment-dialog.styles";
 import styles from "./tip-screen.module.css";
 
@@ -74,7 +74,7 @@ export function TipCheckoutButton({
         />
       ) : null}
       {paymentLaunch.shouldShowStripeDialog && paymentLaunch.stripeClientSecret ? (
-        <StripePaymentDialog
+        <LazyStripePaymentDialog
           clientSecret={paymentLaunch.stripeClientSecret}
           returnPath={returnPath}
           onClose={paymentLaunch.handleStripeClose}