fix: add public/fonts to viteStaticCopy targets

public/fonts/ (custom-fonts.css + woff2 files) was never listed in the
static copy plugin config, so it was absent from every dist build output.
The site served HTML instead of CSS for /fonts/custom-fonts.css, causing
JetBrains Mono and Fira Code to 404. Adding the target copies the directory
to dist/fonts/ where nginx serves it correctly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

vite.config.js

@@ -46,6 +46,11 @@ const copyFiles = {
       dest: 'public/',
       rename: { stripBase: 1 },
     },
+    {
+      src: 'public/fonts',
+      dest: '',
+      rename: { stripBase: 1 },
+    },
   ],
 };