화면관리 ui개선 및 파일업로드 설정

frontend/components/screen/toolbar/LeftUnifiedToolbar.tsx

@@ -3,7 +3,7 @@
 import React from "react";
 import { Button } from "@/components/ui/button";
 import { Badge } from "@/components/ui/badge";
-import { Database, Layout, Cog, Settings, Palette, Monitor, Square } from "lucide-react";
+import { Database, Layout, Cog, Settings, Palette, Monitor } from "lucide-react";
 import { cn } from "@/lib/utils";
 
 export interface ToolbarButton {
@@ -110,14 +110,6 @@ export const defaultToolbarButtons: ToolbarButton[] = [
     group: "editor",
     panelWidth: 300,
   },
-  {
-    id: "zone",
-    label: "구역",
-    icon: <Square className="h-5 w-5" />,
-    shortcut: "Z",
-    group: "editor",
-    panelWidth: 0, // 토글만 (패널 없음)
-  },
 ];
 
 export default LeftUnifiedToolbar;