feat: enhance list management UI with create, edit, and delete functionality

- Add ListForm component for creating and editing lists with color picker
- Add Modal component for reusable dialog functionality
- Add DeleteListButton with confirmation dialog
- Add NewListButton for creating new lists
- Update ListCard to show edit/delete buttons on hover
- Update home page to use new list creation flow
- All components include proper error handling and loading states

Requirements: 2.1, 2.2, 2.4, 2.5

app/page.tsx

@@ -1,6 +1,6 @@
-import { PlusIcon } from 'lucide-react'
 import { getLists } from '@/lib/actions'
 import ListCard from '@/components/ListCard'
+import NewListButton from '@/components/NewListButton'
 
 export default async function Home() {
   const lists = await getLists()
@@ -9,10 +9,7 @@ export default async function Home() {
     <main className="container mx-auto px-4 py-8 max-w-4xl">
       <div className="flex items-center justify-between mb-8">
         <h1 className="text-3xl font-bold text-gray-900">Ultimate Lists</h1>
-        <button className="bg-blue-500 hover:bg-blue-600 text-white px-4 py-2 rounded-lg flex items-center gap-2 transition-colors">
-          <PlusIcon size={20} />
-          New List
-        </button>
+        <NewListButton />
       </div>
 
       <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">