feat: refine letters UI

app/journals/[slug]/[chapter]/page.tsx

@@ -41,7 +41,7 @@ export default async function JournalChapterPage({
 
   return (
     <div className="min-h-screen bg-background">
-      <PageHeader sticky wide>
+      <PageHeader sticky>
         <Link
           href={`/journals/${slug}`}
           className="text-sm text-muted-foreground hover:text-foreground transition-colors"
@@ -53,7 +53,7 @@ export default async function JournalChapterPage({
         </h1>
       </PageHeader>
 
-      <div className="w-full md:max-w-6xl mx-auto flex">
+      <div className="max-w-5xl mx-auto flex">
         <ChapterSidebar
           items={sidebarItems}
           currentSlug={chapterSlug}