chore: dark navy PWA icons from brand guidelines (#87)

* chore: replace PWA icons with dark navy background from brand guidelines

Replaces white-background bolt icons with dark navy (#041017) versions
from brand guidelines. Looks clean as circular app icon on mobile home
screens — no more white square standing out.

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

* fix: embed share URL in tweet text instead of &url= param

The &url= parameter in Twitter intent URLs causes the composer to get
stuck reloading state before showing the post preview. Embedding the
URL directly in the tweet text avoids this — Twitter still auto-links
and crawls the OG card.

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

---------

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

Author: techgangboss

public/icons/icon-192x192.png

@@ -474,8 +474,11 @@ export function SwapToast({ hash }: { hash: string }) {
                   if (secs <= 4.1) {
                     fetch(`${window.location.origin}/og/preconfirm/${elapsedSec}`).catch(() => {})
                   }
+                  // Embed URL in tweet text rather than using &url= param
+                  // The &url= param causes Twitter composer to get stuck reloading state
+                  const tweetText = `${text}\n\n${shareUrl}`
                   window.open(
-                    `https://twitter.com/intent/tweet?text=${encodeURIComponent(text)}&url=${encodeURIComponent(shareUrl)}`,
+                    `https://twitter.com/intent/tweet?text=${encodeURIComponent(tweetText)}`,
                     "_blank"
                   )
                 }}