"Update icons for better UI representation"

backend/app/static/favicon.svg

@@ -1 +1,21 @@
- 
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 80 80" width="80" height="80">
+  <defs>
+    <style>
+      .mb-logo { fill: currentColor; }
+      @media (prefers-color-scheme: dark) {
+        .mb-logo { fill: #ffffff; }
+      }
+      @media (prefers-color-scheme: light) {
+        .mb-logo { fill: #000000; }
+      }
+    </style>
+  </defs>
+  
+  <!-- Mercedes-Benz Logo -->
+  <path class="mb-logo" d="M58.6,4.5C53,1.6,46.7,0,40,0c-6.7,0-13,1.6-18.6,4.5v0C8.7,11.2,0,24.6,0,40c0,15.4,8.7,28.8,21.5,35.5
+    C27,78.3,33.3,80,40,80c6.7,0,12.9-1.7,18.5-4.6C71.3,68.8,80,55.4,80,40C80,24.6,71.3,11.2,58.6,4.5z M4,40
+    c0-13.1,7-24.5,17.5-30.9v0C26.6,6,32.5,4.2,39,4l-4.5,32.7L21.5,46.8v0L8.3,57.1C5.6,52,4,46.2,4,40z M58.6,70.8
+    C53.1,74.1,46.8,76,40,76c-6.8,0-13.2-1.9-18.6-5.2c-4.9-2.9-8.9-6.9-11.9-11.7l11.9-4.9v0L40,46.6l18.6,7.5v0l12,4.9
+    C67.6,63.9,63.4,67.9,58.6,70.8z M58.6,46.8L58.6,46.8l-12.9-10L41.1,4c6.3,0.2,12.3,2,17.4,5.1v0C69,15.4,76,26.9,76,40
+    c0,6.2-1.5,12-4.3,17.1L58.6,46.8z"/>
+</svg>