ArcLab

Refactor App component to initialize code state with a default Python function, enhance runCode logic to handle submissions, and improve output handling in usePython hook. Update SubmissionsPane to display predicted outputs on hover and highlight incorrect submissions. Modify Grid component to accept additional className prop for styling.

Add react-resizable-panels for layout management and integrate react-query for data fetching

🔧 Add nix flake for dev env on nix