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}