Rewrote twig grammar

src-web/components/DropMarker.tsx

@@ -0,0 +1,12 @@
+import React, { memo } from 'react';
+
+export const DropMarker = memo(
+  function DropMarker() {
+    return (
+      <div className="relative w-full h-0 overflow-visible pointer-events-none">
+        <div className="absolute z-50 left-2 right-2 bottom-[1px] h-[0.2em] bg-blue-500/50 rounded-full" />
+      </div>
+    );
+  },
+  () => true,
+);