Update favicon to unified Wild product family design language

Orange terminal prompt icon with white stroke-based line art on rounded rect,
matching the shared visual identity across Wild Central, Cloud, and Directory.

app/public/favicon.svg

@@ -1,6 +1,8 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
-  <rect x="1" y="1" width="30" height="30" rx="7" fill="#58a6ff"/>
-  <path d="M8 10 L11.5 22 L16 14.5 L20.5 22 L24 10"
-        fill="none" stroke="#0f1117" stroke-width="3.1"
-        stroke-linejoin="round" stroke-linecap="round"/>
+  <rect width="32" height="32" rx="6" fill="#ea580c"/>
+  <g stroke="white" fill="none" stroke-width="2"
+     stroke-linecap="round" stroke-linejoin="round">
+    <polyline points="7,11 14,16 7,21"/>
+    <line x1="17" y1="21" x2="25" y2="21"/>
+  </g>
 </svg>