fix(cli): utf-8 decode for whatsapp-bridge npm install capture (sibling of #43790)

hermes_cli/main.py

@@ -2419,6 +2419,8 @@ def cmd_whatsapp(args):
                 stdout=subprocess.DEVNULL,
                 stderr=subprocess.PIPE,
                 text=True,
+                encoding="utf-8",
+                errors="replace",
             )
         except KeyboardInterrupt:
             print("\n  ✗ Install cancelled")