Move permission badge and share button to list title line

- Created ListHeader component with permission and share on same line as title
- Permission badge and share button now appear to the right of the title
- Removed permission/share section from ListDetailView
- More compact header layout with better use of space

components/ListDetailView.tsx

@@ -156,26 +156,6 @@ export default function ListDetailView({
 
   return (
     <div className="space-y-6">
-      {/* Permission Badge and Share Button */}
-      {(permission || canShare) && (
-        <div className="flex items-center justify-between gap-4">
-          {permission && (
-            <div>
-              <PermissionBadge permission={permission} />
-            </div>
-          )}
-          {canShare && (
-            <button
-              onClick={() => setIsShareModalOpen(true)}
-              className="ml-auto flex items-center gap-2 px-4 py-2 bg-blue-500 hover:bg-blue-600 active:bg-blue-700 text-white rounded-lg transition-colors text-sm font-medium"
-            >
-              <Share2 size={16} />
-              Share
-            </button>
-          )}
-        </div>
-      )}
-
       {/* Search Bar */}
       <SearchBar 
         onSearch={handleSearchCallback}

components/ListHeader.tsx

@@ -0,0 +1,98 @@
+'use client'
+
+import { useState } from 'react'
+import Link from 'next/link'
+import { ArrowLeft, Share2 } from 'lucide-react'
+import PermissionBadge from './PermissionBadge'
+import ShareListModal from './ShareListModal'
+
+interface ListHeaderProps {
+  listId: string
+  listTitle: string
+  listColor: string
+  completedCount: number
+  totalCount: number
+  permission: 'owner' | 'editor' | 'viewer'
+  canShare: boolean
+  ownerId: string
+  ownerName: string | null | undefined
+  ownerEmail: string
+  collaborators: Array<{
+    id: string
+    permission: 'editor' | 'viewer'
+    user: {
+      id: string
+      name: string | null
+      email: string
+    }
+  }>
+}
+
+export default function ListHeader({
+  listId,
+  listTitle,
+  listColor,
+  completedCount,
+  totalCount,
+  permission,
+  canShare,
+  ownerId,
+  ownerName,
+  ownerEmail,
+  collaborators
+}: ListHeaderProps) {
+  const [isShareModalOpen, setIsShareModalOpen] = useState(false)
+
+  return (
+    <>
+      <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 justify-between gap-3 mb-2">
+          <div className="flex items-center gap-2 sm:gap-3 min-w-0 flex-1">
+            <div 
+              className="w-5 h-5 sm:w-6 sm:h-6 rounded-full flex-shrink-0" 
+              style={{ backgroundColor: listColor }}
+            />
+            <h1 className="text-2xl sm:text-3xl lg:text-4xl font-bold text-gray-900 truncate">{listTitle}</h1>
+          </div>
+          
+          <div className="flex items-center gap-2 flex-shrink-0">
+            <PermissionBadge permission={permission} />
+            {canShare && (
+              <button
+                onClick={() => setIsShareModalOpen(true)}
+                className="flex items-center gap-2 px-3 py-1.5 bg-blue-500 hover:bg-blue-600 active:bg-blue-700 text-white rounded-lg transition-colors text-sm font-medium"
+              >
+                <Share2 size={16} />
+                <span className="hidden sm:inline">Share</span>
+              </button>
+            )}
+          </div>
+        </div>
+        
+        <p className="text-gray-600 text-sm sm:text-base">
+          {completedCount} of {totalCount} tasks completed
+        </p>
+      </div>
+
+      <ShareListModal
+        isOpen={isShareModalOpen}
+        onClose={() => setIsShareModalOpen(false)}
+        listId={listId}
+        listTitle={listTitle}
+        isOwner={permission === 'owner'}
+        ownerId={ownerId}
+        ownerName={ownerName}
+        ownerEmail={ownerEmail}
+        initialCollaborators={collaborators}
+      />
+    </>
+  )
+}