fix(website): replace favicon.svg with user-supplied design

Replace the auto-generated 48x48 dark-mode-aware favicon (introduced
in #12285) with a user-supplied 500x500 design.

The new design uses the same Comfy C-shape geometry rendered tighter
inside a solid black square (no dark-mode color swap). The user
supplied the exact SVG.

No code changes: BaseLayout.astro still references /favicon.svg, so
this is a content-only swap of the file at apps/website/public/favicon.svg.

apps/website/public/favicon.svg

@@ -1,14 +1,9 @@
-<svg width="48" height="48" viewBox="0 0 48 48" xmlns="http://www.w3.org/2000/svg">
-  <style>
-    .bg { fill: #000000; }
-    .fg { fill: #F2FF59; }
-    @media (prefers-color-scheme: dark) {
-      .bg { fill: #F2FF59; }
-      .fg { fill: #000000; }
-    }
-  </style>
-  <circle class="bg" cx="24" cy="24" r="24"/>
-  <g transform="translate(7.8 6.72) scale(0.72)">
-    <path class="fg" d="M35.6487 36.021C35.733 35.7387 35.7791 35.4411 35.7791 35.1283C35.7791 33.3963 34.3675 31.9924 32.6262 31.9924H18.4956C17.7361 32 17.1147 31.3896 17.1147 30.6342C17.1147 30.4969 17.1377 30.3672 17.1684 30.2451L20.9734 17.0606C21.1345 16.4807 21.6715 16.0534 22.3005 16.0534L36.4848 16.0382C39.4766 16.0382 42.0005 14.0315 42.76 11.2923L44.8926 3.94468C44.9616 3.68526 45 3.40296 45 3.12065C45 1.39628 43.5961 0 41.8624 0L24.7017 0C21.7252 0 19.209 1.99142 18.4342 4.70005L16.992 9.71292C16.8232 10.2852 16.2939 10.7048 15.6648 10.7048H11.5453C8.59189 10.7048 6.0987 12.6581 5.30089 15.3362L0.11507 33.3505C0.0383566 33.6175 0 33.9075 0 34.1974C0 35.9294 1.41152 37.3333 3.15292 37.3333H7.20338C7.96284 37.3333 8.58421 37.9437 8.58421 38.7067C8.58421 38.8364 8.56887 38.9661 8.53051 39.0882L7.09598 44.0553C7.02694 44.3224 6.98091 44.597 6.98091 44.8794C6.98091 46.6037 8.38476 48 10.1185 48L27.2869 47.9847C30.2711 47.9847 32.7873 45.9857 33.5544 43.2618L35.641 36.0286L35.6487 36.021Z"/>
-  </g>
+<svg width="500" height="500" viewBox="0 0 500 500" fill="none" xmlns="http://www.w3.org/2000/svg">
+<mask id="mask0_386_76" style="mask-type:alpha" maskUnits="userSpaceOnUse" x="0" y="0" width="500" height="500">
+<rect width="500" height="500" fill="#F2FF59"/>
+</mask>
+<g mask="url(#mask0_386_76)">
+<rect width="500" height="500" fill="black"/>
+<path d="M371.309 354.247C372.037 351.787 372.434 349.195 372.434 346.47C372.434 331.381 360.254 319.15 345.228 319.15H223.298C216.745 319.217 211.383 313.899 211.383 307.318C211.383 306.122 211.582 304.992 211.846 303.928L244.679 189.067C246.069 184.016 250.703 180.293 256.131 180.293L378.524 180.16C404.34 180.16 426.118 162.679 432.671 138.816L451.073 74.8047C451.669 72.5447 452 70.0853 452 67.6259C452 52.6036 439.886 40.4395 424.926 40.4395H276.849C251.166 40.4395 229.454 57.7882 222.769 81.3853L210.324 125.056C208.868 130.042 204.3 133.698 198.872 133.698H163.326C137.841 133.698 116.328 150.714 109.444 174.045L64.6961 330.982C64.0342 333.308 63.7032 335.834 63.7032 338.36C63.7032 353.449 75.883 365.68 90.9091 365.68H125.86C132.413 365.68 137.775 370.997 137.775 377.644C137.775 378.774 137.642 379.904 137.311 380.968L124.933 424.24C124.337 426.566 123.94 428.959 123.94 431.419C123.94 446.441 136.054 458.605 151.014 458.605L299.157 458.472C324.907 458.472 346.618 441.057 353.238 417.327L371.243 354.313L371.309 354.247Z" fill="#F2FF59"/>
+</g>
 </svg>