[fix](trx-frontend-http): serve safari-friendly favicon

Co-authored-by: Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html

@@ -4,7 +4,8 @@
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
   <title>trx-rs v{ver}</title>
-  <link rel="icon" href="/favicon.ico?v=2" />
+  <link rel="icon" type="image/png" href="/favicon.png?v=3" />
+  <link rel="apple-touch-icon" href="/favicon.png?v=3" />
   <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fontsource/dseg14-classic/400.css" />
   <link rel="stylesheet" href="/style.css" />
   <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" />