Remove SyncIndicator to fix hydration errors

- Removed SyncIndicator component causing hydration issues
- Background polling still works for real-time updates
- Updates appear within 1 second without visual indicator

app/list/[id]/page.tsx

@@ -7,7 +7,6 @@ import Link from 'next/link'
 import { ArrowLeft } from 'lucide-react'
 import InlineItemCreate from '@/components/InlineItemCreate'
 import ListDetailView from '@/components/ListDetailView'
-import SyncIndicator from '@/components/SyncIndicator'
 
 export const dynamic = 'force-dynamic'
 export const revalidate = 0
@@ -36,7 +35,6 @@ export default async function ListDetailPage({ params }: { params: { id: string
 
   return (
     <main className="container mx-auto px-4 sm:px-6 py-6 sm:py-8 max-w-6xl">
-      <SyncIndicator />
       {/* Header */}
       <div className="mb-6 sm:mb-8">
         <Link