Fix build type errors in LinkButton and useMessages

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

src/components/common/LinkButton.tsx

@@ -25,17 +25,15 @@ export function LinkButton({
 }: LinkButtonProps) {
   const { dir } = useLocale();
 
-  return (
-    <Button {...props} variant={variant} asChild>
-      {asAnchor ? (
-        <a href={href} target={target}>
-          {children}
-        </a>
-      ) : (
-        <Link href={href} dir={dir} scroll={scroll} target={target} prefetch={prefetch}>
-          {children}
-        </Link>
-      )}
-    </Button>
+  const linkElement = asAnchor ? (
+    <a href={href} target={target}>
+      {children}
+    </a>
+  ) : (
+    <Link href={href} dir={dir} scroll={scroll} target={target} prefetch={prefetch}>
+      {children}
+    </Link>
   );
+
+  return <Button {...props} variant={variant} render={linkElement} />;
 }

src/components/hooks/useMessages.ts

@@ -7,12 +7,16 @@ export function useMessages() {
 
   const getMessage = (id: string) => t(`message.${id}`);
 
-  const getErrorMessage = (error: ApiError) => {
+  const getErrorMessage = (error: string | Error | undefined) => {
     if (!error) {
       return undefined;
     }
 
-    const code = error?.code;
+    if (typeof error === 'string') {
+      return error;
+    }
+
+    const code = (error as ApiError)?.code;
 
     return code ? getMessage(code) : error?.message || 'Unknown error';
   };