perf: cut LCP/page weight and lift Lighthouse scores across the board

Sizes Sanity team-photo/logo fetches instead of pulling full-resolution
originals, converts static PNGs to WebP, drops the unused image-slot.js
drag-and-drop scaffold (dead weight in production), lazy-loads
Blog/Financing/Ventures/BlogPost routes, and defers the Google Fonts
stylesheet so it stops blocking first paint. Also adds <main> landmarks
and fixes a few unlabeled form controls picked up along the way.

Local Lighthouse (desktop): Performance 94->100, Accessibility 79->96,
LCP 1.6s->0.5s, total page weight 1368KiB->276KiB.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: minuitcinq

index.html

@@ -55,10 +55,23 @@
 
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
+    <link
+      rel="preload"
+      as="style"
+      href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;900&family=Great+Vibes&display=swap"
+    />
     <link
       href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;900&family=Great+Vibes&display=swap"
       rel="stylesheet"
+      media="print"
+      onload="this.media='all'"
     />
+    <noscript>
+      <link
+        href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;900&family=Great+Vibes&display=swap"
+        rel="stylesheet"
+      />
+    </noscript>
 
     <script type="application/ld+json">
       {