feat(@workspace/@editor): add UndoButton component

src/app/(app)/playground/@workspace/@editor/components/undo-button.tsx

@@ -0,0 +1,37 @@
+"use client";
+
+import {
+  Tooltip,
+  TooltipContent,
+  TooltipProvider,
+  TooltipTrigger,
+} from "@/components/ui/tooltip";
+import { Undo2 } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { useCodeEditorState } from "@/store/useCodeEditor";
+
+export default function UndoButton() {
+  const { editor } = useCodeEditorState();
+  return (
+    <TooltipProvider delayDuration={0}>
+      <Tooltip>
+        <TooltipTrigger asChild>
+          <Button
+            variant="outline"
+            size="icon"
+            aria-label="Undo Code"
+            onClick={() => {
+              editor?.trigger("undo", "undo", null);
+            }}
+            className="h-6 w-6 px-1.5 py-0.5 border-none hover:bg-muted"
+          >
+            <Undo2 size={16} strokeWidth={2} aria-hidden="true" />
+          </Button>
+        </TooltipTrigger>
+        <TooltipContent className="px-2 py-1 text-xs">
+          Undo Code
+        </TooltipContent>
+      </Tooltip>
+    </TooltipProvider>
+  );
+}