[fix](trx-frontend): add footer project link and safari favicon fix

Add the trx-rs GitHub link in the footer and make favicon handling more explicit for Safari.

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

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

@@ -4,8 +4,10 @@
   <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" type="image/png" href="/favicon.png?v=3" />
-  <link rel="apple-touch-icon" href="/favicon.png?v=3" />
+  <link rel="icon" type="image/png" sizes="32x32" href="/favicon.png?v=4" />
+  <link rel="icon" type="image/png" sizes="16x16" href="/favicon.png?v=4" />
+  <link rel="shortcut icon" href="/favicon.png?v=4" />
+  <link rel="apple-touch-icon" sizes="180x180" href="/favicon.png?v=4" />
   <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" />
@@ -398,7 +400,7 @@
     </div>
     <div class="footer">
       <div class="copyright">
-        Built by <a href="https://www.qrzcq.com/call/SP2SJG" target="_blank" rel="noopener">SP2SJG</a> from <a href="https://haxx.space" target="_blank" rel="noopener">haxx.space</a> — <span id="copyright-year"></span>
+        Built by <a href="https://www.qrzcq.com/call/SP2SJG" target="_blank" rel="noopener">SP2SJG</a> from <a href="https://haxx.space" target="_blank" rel="noopener">haxx.space</a> · <a href="https://github.com/sgrams/trx-rs" target="_blank" rel="noopener">trx-rs on GitHub</a> — <span id="copyright-year"></span>
         - <span id="footer-server-build">trx-server v-- --</span>
         - <span id="footer-client-build">trx-client v{ver} {client_build_date}</span>
       </div>

src/trx-client/trx-frontend/trx-frontend-http/src/api.rs

@@ -775,9 +775,9 @@ async fn index() -> impl Responder {
 
 #[get("/favicon.ico")]
 async fn favicon() -> impl Responder {
-    HttpResponse::Ok()
-        .insert_header((header::CONTENT_TYPE, "image/png"))
-        .body(FAVICON_BYTES)
+    HttpResponse::TemporaryRedirect()
+        .insert_header((header::LOCATION, "/favicon.png?v=4"))
+        .finish()
 }
 
 #[get("/favicon.png")]