Add arrow fn detection as a node

Currently the arrow functions are treated as a variable rather than a function, This is completely erroneous.
<img width="651" height="152" alt="Image" src="https://github.com/user-attachments/assets/b3534729-ea99-4ac2-b2ef-465c053e02f9" />

<img width="1804" height="1035" alt="Image" src="https://github.com/user-attachments/assets/5c494a52-cf98-4566-be53-0ad93bb67c06" />