feat(workspace): add editor layout with footer for problem page

src/app/(app)/problems/[id]/@workspace/@editor/layout.tsx

@@ -0,0 +1,16 @@
+import WorkspaceEditorFooter from "@/features/playground/workspace/editor/footer";
+
+interface WorkspaceEditorLayoutProps {
+  children: React.ReactNode;
+}
+
+export default function WorkspaceEditorLayout({
+  children,
+}: WorkspaceEditorLayoutProps) {
+  return (
+    <div className="h-full flex flex-col">
+      <div className="flex-1">{children}</div>
+      <WorkspaceEditorFooter />
+    </div>
+  );
+}