Project codebase cleanup - rm unused /calendar and other utils and components

Check the below (expected for components):

<img width="1597" height="751" alt="Image" src="https://github.com/user-attachments/assets/c7687377-bafd-4f9d-ad7f-c0c2ea76ff88" />

Multiple unused /calendar and other utils and components to clean up 
<img width="1594" height="470" alt="Image" src="https://github.com/user-attachments/assets/6c3df225-7a99-4969-9051-e79827538cb1" />