Template Tag Function Editor (#67)

![CleanShot 2024-08-15 at 16 53
09@2x](https://github.com/user-attachments/assets/8c0eb655-1daf-4dc8-811f-f606c770f7dc)

src-web/lib/truncate.ts

@@ -0,0 +1,4 @@
+export function truncate(text: string, len: number): string {
+  if (text.length <= len) return text;
+  return text.slice(0, len) + '…';
+}