fix: add PNG favicon fallback to dashboard index.html

Author: jddunn

src/cli/dashboard/index.html

@@ -33,6 +33,7 @@
     <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
 
     <!-- Favicon -->
+    <link rel="icon" href="/favicon.png" sizes="32x32" />
     <link rel="icon" type="image/svg+xml" href="/icon.svg" />
     <link rel="icon" type="image/png" sizes="32x32" href="/brand/favicons/favicon-32.png" />
     <link rel="icon" type="image/png" sizes="16x16" href="/brand/favicons/favicon-16.png" />