feat: refine letters UI

app/books/mog/[chapter]/page.tsx

@@ -45,7 +45,7 @@ export default async function MogChapterPage({
 
   return (
     <div className="min-h-screen bg-background">
-      <PageHeader sticky wide>
+      <PageHeader sticky>
         <Link
           href="/books/mog"
           className="text-sm text-muted-foreground hover:text-foreground transition-colors"
@@ -60,7 +60,7 @@ export default async function MogChapterPage({
         </h1>
       </PageHeader>
 
-      <div className="w-full md:max-w-6xl mx-auto flex">
+      <div className="max-w-5xl mx-auto flex">
         {/* Left sidebar */}
         <MogSidebar items={sidebarItems} currentSlug={slug} />
 

app/books/mog/page.tsx

@@ -27,7 +27,7 @@ export default async function MogPage() {
         <p className="mt-1 text-muted-foreground">{meta.author}</p>
       </PageHeader>
 
-      <main className="max-w-3xl mx-auto px-6 py-8 space-y-8">
+      <main className="max-w-5xl mx-auto px-6 py-8 space-y-8">
         {/* Description */}
         {meta.description && (
           <p className="text-muted-foreground">{meta.description}</p>