Fix Avatar for Vercel.

src/components/common/Avatar.tsx

@@ -5,17 +5,41 @@ import { getColor, getPastel } from '@/lib/colors';
 
 const lib = lorelei;
 
+// ✅ Modern UTF-8 safe base64 encoder (no deprecated APIs)
+function toBase64(str: string): string {
+  if (typeof window === 'undefined') {
+    // Server (Node.js)
+    return Buffer.from(str, 'utf-8').toString('base64');
+  } else {
+    // Browser (UTF-8 safe)
+    const encoder = new TextEncoder();
+    const bytes = encoder.encode(str);
+    let binary = '';
+    const chunkSize = 0x8000;
+
+    for (let i = 0; i < bytes.length; i += chunkSize) {
+      const chunk = bytes.subarray(i, i + chunkSize);
+      binary += String.fromCharCode(...chunk);
+    }
+
+    return btoa(binary);
+  }
+}
+
 export function Avatar({ seed, size = 128, ...props }: { seed: string; size?: number }) {
   const backgroundColor = getPastel(getColor(seed), 4);
 
   const avatar = useMemo(() => {
-    return createAvatar(lib, {
+    const svg = createAvatar(lib, {
       ...props,
       seed,
       size,
       backgroundColor: [backgroundColor],
-    }).toDataUri();
-  }, []);
+    }).toString();
+
+    const base64 = toBase64(svg);
+    return `data:image/svg+xml;base64,${base64}`;
+  }, [seed, size, backgroundColor, props]);
 
   return <img src={avatar} alt="Avatar" style={{ borderRadius: '100%', width: size }} />;
 }