fix(esign): cast helpers to any to fix TS build after barrel conversion

The types barrel conversion (427736a) made extension helpers resolve
to unknown in strict TS mode, breaking the esign prepublishOnly build.

Matches the pattern already used in template-builder.

Author: caio-pizzol

packages/esign/src/index.tsx

@@ -129,7 +129,10 @@ const SuperDocESign = forwardRef<Types.SuperDocESignHandle, Types.SuperDocESignP
     (editor: Editor) => {
       if (!editor) return;
 
-      const tags = editor.helpers.structuredContentCommands.getStructuredContentTags(editor.state);
+      const structuredContentHelpers = (editor.helpers as any)?.structuredContentCommands;
+      if (!structuredContentHelpers?.getStructuredContentTags) return;
+
+      const tags = structuredContentHelpers.getStructuredContentTags(editor.state);
 
       const configValues = new Map<string, Types.FieldValue | Types.TableFieldValue>();