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

components/Modal.tsx

@@ -0,0 +1,71 @@
+'use client'
+
+import { useEffect } from 'react'
+import { X } from 'lucide-react'
+
+interface ModalProps {
+  isOpen: boolean
+  onClose: () => void
+  title: string
+  children: React.ReactNode
+}
+
+export default function Modal({ isOpen, onClose, title, children }: ModalProps) {
+  useEffect(() => {
+    if (isOpen) {
+      document.body.style.overflow = 'hidden'
+    } else {
+      document.body.style.overflow = 'unset'
+    }
+
+    return () => {
+      document.body.style.overflow = 'unset'
+    }
+  }, [isOpen])
+
+  useEffect(() => {
+    const handleEscape = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') {
+        onClose()
+      }
+    }
+
+    if (isOpen) {
+      document.addEventListener('keydown', handleEscape)
+    }
+
+    return () => {
+      document.removeEventListener('keydown', handleEscape)
+    }
+  }, [isOpen, onClose])
+
+  if (!isOpen) return null
+
+  return (
+    <div className="fixed inset-0 z-50 flex items-center justify-center">
+      {/* Backdrop */}
+      <div 
+        className="absolute inset-0 bg-black bg-opacity-50"
+        onClick={onClose}
+      />
+      
+      {/* Modal */}
+      <div className="relative bg-white rounded-lg shadow-xl max-w-md w-full mx-4 max-h-[90vh] overflow-y-auto">
+        <div className="flex items-center justify-between p-4 border-b border-gray-200">
+          <h2 className="text-xl font-semibold text-gray-900">{title}</h2>
+          <button
+            onClick={onClose}
+            className="text-gray-400 hover:text-gray-600 transition-colors"
+            aria-label="Close modal"
+          >
+            <X size={24} />
+          </button>
+        </div>
+        
+        <div className="p-4">
+          {children}
+        </div>
+      </div>
+    </div>
+  )
+}