feat: [US-038] - Unsaved changes warning

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/editor/[projectId]/page.tsx

@@ -1,6 +1,5 @@
 import { createClient } from '@/lib/supabase/server'
 import { notFound } from 'next/navigation'
-import Link from 'next/link'
 import FlowchartEditor from './FlowchartEditor'
 import type { FlowchartData } from '@/types/flowchart'
 
@@ -37,39 +36,10 @@ export default async function EditorPage({ params }: PageProps) {
   }) as FlowchartData
 
   return (
-    <div className="flex h-screen flex-col">
-      <header className="flex items-center justify-between border-b border-zinc-200 bg-white px-4 py-3 dark:border-zinc-700 dark:bg-zinc-900">
-        <div className="flex items-center gap-4">
-          <Link
-            href="/dashboard"
-            className="text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-zinc-50"
-          >
-            <svg
-              xmlns="http://www.w3.org/2000/svg"
-              className="h-5 w-5"
-              viewBox="0 0 20 20"
-              fill="currentColor"
-            >
-              <path
-                fillRule="evenodd"
-                d="M9.707 16.707a1 1 0 01-1.414 0l-6-6a1 1 0 010-1.414l6-6a1 1 0 011.414 1.414L5.414 9H17a1 1 0 110 2H5.414l4.293 4.293a1 1 0 010 1.414z"
-                clipRule="evenodd"
-              />
-            </svg>
-          </Link>
-          <h1 className="text-lg font-semibold text-zinc-900 dark:text-zinc-50">
-            {project.name}
-          </h1>
-        </div>
-      </header>
-
-      <div className="flex-1">
-        <FlowchartEditor
-          projectId={project.id}
-          projectName={project.name}
-          initialData={flowchartData}
-        />
-      </div>
-    </div>
+    <FlowchartEditor
+      projectId={project.id}
+      projectName={project.name}
+      initialData={flowchartData}
+    />
   )
 }