#174 エラー回避と誤記修正

frontend/src/components/TagDetailSidebar.tsx

@@ -29,7 +29,7 @@ const renderTagTree = (
   return [self,
 	  ...(tag.children
 	      ?.sort ((a, b) => a.name < b.name ? -1 : 1)
-	      .flatMap (child => renderTagTree (child, nestLevel + 2, key)) ?? [])]
+	      .flatMap (child => renderTagTree (child, nestLevel + 1, key)) ?? [])]
 }