Fix favicon centering, boost font weight; increase nav mark font size

ddiff --git a/public/favicon.svg b/public/favicon.svg
iindex 5421532..adc2187 100644
---- a/public/favicon.svg
++++ b/public/favicon.svg
@@@ -6,5 +6,5 @@
      </linearGradient>
    </defs>
    <rect width="64" height="64" rx="14" fill="url(#g)"/>
--  <text x="50%" y="56%" text-anchor="middle" font-family="Space Grotesk, sans-serif" font-weight="700" font-size="28" fill="#06221c">AF</text>
++  <text x="32" y="32" text-anchor="middle" dominant-baseline="central" font-family="Arial, sans-serif" font-weight="800" font-size="30" letter-spacing="-1" fill="#06221c">AF</text>
  </svg>
ddiff --git a/src/components/Nav.astro b/src/components/Nav.astro
iindex 62684d8..a41b9a3 100644
---- a/src/components/Nav.astro
++++ b/src/components/Nav.astro
@@@ -74,7 +74,7 @@ const links = [
      width: 34px; height: 34px;
      border-radius: 10px;
      background: linear-gradient(135deg, var(--accent), var(--accent-3));
--    color: #06221c; font-size: 0.9rem; letter-spacing: -0.02em;
++    color: #06221c; font-size: 1.05rem; font-weight: 800; letter-spacing: -0.04em;
    }
  
    /* Desktop nav — fills middle, centered */