[fix](trx-rs): refine wfm denoise and favicon handling

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

@@ -4,10 +4,9 @@
   <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" 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="icon" type="image/png" sizes="any" href="/favicon.ico?v=5" />
+  <link rel="shortcut icon" href="/favicon.ico?v=5" />
+  <link rel="apple-touch-icon" sizes="180x180" href="/favicon.png?v=5" />
   <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" />
@@ -179,6 +178,7 @@
                   <label class="wfm-control">
                     <span class="wfm-control-label">Denoise Level</span>
                     <select id="wfm-denoise" class="status-input">
+                      <option value="off">Off</option>
                       <option value="auto">Auto</option>
                       <option value="low">Low</option>
                       <option value="medium">Medium</option>