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

components/ListDetailView.tsx

@@ -156,6 +156,22 @@ export default function ListDetailView({
 
   return (
     <div className="space-y-6">
+      {/* Permission Badge and Share Button */}
+      {(permission || canShare) && (
+        <div className="flex items-center gap-2">
+          {permission && <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>
+      )}
+
       {/* Search Bar */}
       <SearchBar 
         onSearch={handleSearchCallback}