feat: use speed OG card for swaps <= 4.1s, generic OG for slower

The branded speed card (Clonoid font, designer background) only
shows for fast swaps. Slower swaps link to the main site which
uses the generic Fast Protocol OG image.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: techgangboss

src/components/swap/SwapToast.tsx

@@ -465,8 +465,11 @@ export function SwapToast({ hash }: { hash: string }) {
 
                   const variants = secs < 1 ? fast : secs < 4 ? mid : slow
                   const text = variants[Math.floor(Math.random() * variants.length)]
-                  // Twitter needs a URL in the tweet to render the OG card
-                  const shareUrl = `${window.location.origin}/share/preconfirm?time=${elapsedSec}`
+                  // Speed OG card for fast swaps, generic for slower ones
+                  const shareUrl =
+                    secs <= 4.1
+                      ? `${window.location.origin}/share/preconfirm?time=${elapsedSec}`
+                      : `${window.location.origin}`
                   window.open(
                     `https://twitter.com/intent/tweet?text=${encodeURIComponent(text)}&url=${encodeURIComponent(shareUrl)}`,
                     "_blank"