fix: add error handling and use existing utility

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

app/download/SearchForm.tsx

@@ -3,8 +3,15 @@
 
 import { useState } from 'react';
 import useSWR from 'swr';
+import { formatVersion } from '@/lib/fs-utils';
 
-const fetcher = (url: string) => fetch(url).then((res) => res.json());
+const fetcher = async (url: string) => {
+  const res = await fetch(url);
+  if (!res.ok) {
+    throw new Error(`HTTP error: ${res.status}`);
+  }
+  return res.json();
+};
 
 interface SearchFormProps {
   onSearch: (project: string, version: string, commitId: string) => void;
@@ -81,7 +88,7 @@ export default function SearchForm({ onSearch }: SearchFormProps) {
           ) : (
             versions?.map((version: string) => (
               <option key={version} value={version}>
-                {version.replace('_', '.')}
+                {formatVersion(version)}
               </option>
             ))
           )}