feat: add custom Pivoine Rose theme with Bootstrap 4 styling and SVG favicon

asciinema/theme/favicon.svg

@@ -0,0 +1,24 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
+  <!-- Placeholder Favicon - Pivoine Rose themed -->
+  <defs>
+    <linearGradient id="grad" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" style="stop-color:#E63368;stop-opacity:1" />
+      <stop offset="100%" style="stop-color:#CE275B;stop-opacity:1" />
+    </linearGradient>
+  </defs>
+
+  <!-- Background circle -->
+  <circle cx="50" cy="50" r="48" fill="url(#grad)" stroke="#A61E47" stroke-width="2"/>
+
+  <!-- Terminal symbol/Play button hybrid -->
+  <g fill="#FFFFFF">
+    <!-- Terminal prompt bracket -->
+    <path d="M 30 35 L 25 40 L 30 45" stroke="#FFFFFF" stroke-width="3" fill="none" stroke-linecap="round"/>
+
+    <!-- Play triangle (for asciinema recording) -->
+    <path d="M 45 35 L 45 65 L 70 50 Z" fill="#FFFFFF"/>
+  </g>
+
+  <!-- Optional dot for recording indicator -->
+  <circle cx="72" cy="30" r="6" fill="#FFFFFF" opacity="0.9"/>
+</svg>