feat: implement list ownership and access control

- Modified createList to assign ownerId to authenticated user
- Updated getLists to filter by user access (owner or collaborator)
- Added ownership checks to updateList (owner or editor can update)
- Added ownership checks to deleteList (only owner can delete)
- Implemented access control for all item operations (create, update, delete, toggle)
- Updated getItem, searchItems, and getItemsByFilter to enforce access control
- Added dynamic rendering to pages that use authentication
- Cascade deletion already handled by database schema (onDelete: Cascade)

Requirements: 4.1, 4.2, 4.3, 4.5

app/page.tsx

@@ -4,6 +4,8 @@ import NewListButton from '@/components/NewListButton'
 import GlobalSearch from '@/components/GlobalSearch'
 import EmptyState from '@/components/EmptyState'
 
+export const dynamic = 'force-dynamic'
+
 export default async function Home() {
   const lists = await getLists()