Revert ListHeader component to fix webpack error

- Removed ListHeader component causing module loading issues
- Restored original header structure in list page
- Moved permission badge and share button back to ListDetailView
- Kept them on one line for compact layout

app/list/[id]/page.tsx

@@ -7,7 +7,6 @@ import Link from 'next/link'
 import { ArrowLeft } from 'lucide-react'
 import InlineItemCreate from '@/components/InlineItemCreate'
 import ListDetailView from '@/components/ListDetailView'
-import ListHeader from '@/components/ListHeader'
 
 export const dynamic = 'force-dynamic'
 export const revalidate = 0
@@ -37,22 +36,27 @@ export default async function ListDetailPage({ params }: { params: { id: string
   return (
     <main className="container mx-auto px-4 sm:px-6 py-6 sm:py-8 max-w-6xl">
       {/* Header */}
-      <ListHeader
-        listId={list.id}
-        listTitle={list.title}
-        listColor={list.color}
-        completedCount={completedItems.length}
-        totalCount={list.items.length}
-        permission={permission}
-        canShare={canShare}
-        ownerId={list.ownerId}
-        ownerName={list.owner?.name}
-        ownerEmail={list.owner?.email || ''}
-        collaborators={list.collaborators.map(c => ({
-          ...c,
-          permission: c.permission as 'editor' | 'viewer'
-        }))}
-      />
+      <div className="mb-6 sm:mb-8">
+        <Link 
+          href="/" 
+          className="inline-flex items-center gap-2 text-gray-600 hover:text-gray-900 active:text-black mb-4 transition-colors tap-target-sm text-sm sm:text-base"
+        >
+          <ArrowLeft size={20} className="flex-shrink-0" />
+          <span>Back to Lists</span>
+        </Link>
+        
+        <div className="flex items-center gap-2 sm:gap-3 mb-2">
+          <div 
+            className="w-5 h-5 sm:w-6 sm:h-6 rounded-full flex-shrink-0" 
+            style={{ backgroundColor: list.color }}
+          />
+          <h1 className="text-2xl sm:text-3xl lg:text-4xl font-bold text-gray-900 truncate">{list.title}</h1>
+        </div>
+        
+        <p className="text-gray-600 text-sm sm:text-base">
+          {completedItems.length} of {list.items.length} tasks completed
+        </p>
+      </div>
 
       {/* Inline Item Creation - only show if user can edit */}
       {canEdit && (