Update favicon: new SVG and PNG versions

app/static/favicon.svg

@@ -1,18 +1,25 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 120 120" width="120" height="120">
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" role="img" aria-labelledby="title desc">
+  <title id="title">4MONT favicon</title>
+  <desc id="desc">A compact favicon inspired by the 4MONT logo: a blue geometric 4 and bold black M on a clean rounded square.</desc>
   <defs>
-    <linearGradient id="bg" x1="0" y1="0" x2="1" y2="1">
-      <stop offset="0%" stop-color="#0d2a4a"/>
-      <stop offset="100%" stop-color="#1565a0"/>
-    </linearGradient>
-    <linearGradient id="accent" x1="0" y1="0" x2="1" y2="1">
-      <stop offset="0%" stop-color="#2196f3"/>
-      <stop offset="100%" stop-color="#42a5f5"/>
+    <linearGradient id="blue" x1="5" y1="8" x2="38" y2="58" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#0C5CAD"/>
+      <stop offset="0.45" stop-color="#004C92"/>
+      <stop offset="1" stop-color="#002F62"/>
     </linearGradient>
+    <filter id="softShadow" x="-20%" y="-20%" width="140%" height="140%">
+      <feDropShadow dx="0" dy="2" stdDeviation="2" flood-color="#001A33" flood-opacity="0.16"/>
+    </filter>
   </defs>
-  <!-- Background with rounded corners -->
-  <rect width="120" height="120" rx="22" fill="url(#bg)"/>
-  <!-- Decorative top bar -->
-  <rect x="18" y="18" width="84" height="6" rx="3" fill="url(#accent)" opacity="0.9"/>
-  <!-- Letter М -->
-  <path d="M20 98 L20 38 L36 38 L60 72 L84 38 L100 38 L100 98 L84 98 L84 62 L66 90 L54 90 L36 62 L36 98 Z" fill="#ffffff"/>
+
+  <rect x="3" y="3" width="58" height="58" rx="14" fill="#FFFFFF"/>
+  <rect x="3.5" y="3.5" width="57" height="57" rx="13.5" fill="none" stroke="#E6EAF0"/>
+
+  <g filter="url(#softShadow)">
+    <!-- Stylized 4 -->
+    <path fill="url(#blue)" d="M7 38.7 27.4 10.2h10.4v28.5h6.3v8.9h-6.3v7.3H27.9v-7.3H7v-8.9Zm20.9 0V25.2L18 38.7h9.9Z"/>
+
+    <!-- Compact M -->
+    <path fill="#050505" d="M39.2 54.9V10.2h9.4l5.7 16.1 5.7-16.1h9.1v44.7h-8.7V30.2l-4.7 13.3h-3.1l-4.8-13.3v24.7h-8.6Z" transform="translate(-5.4 0)"/>
+  </g>
 </svg>