fix: caching of ts dependencies on save

[bitsbyritik]

/claim #1696

Issue:
TypeScript dependencies were re-downloaded every time a package was saved or the editor loaded, causing unnecessary network requests and slower editor performance.

This PR:

• Adds localStorage caching for ATA fetcher responses.
• Restores cached TS/TSX/DTS files on ATA initialization.
• Caches newly received TypeScript files locally.
• Uses a TTL to avoid stale cache.
• Falls back to network fetch if cache is missing or expired.

2025-09-27.13-17-40.mp4

Benefit: Faster editor startup, reduced network usage, and smoother developer experience while keeping dependencies up-to-date automatically.

[seveibar]

sorry for the delay reviewing this, you can get faster reviews by pinging on the #reviewme channel in discord (https://tscircuit.com/join)

This looks good and i will be testing it. Something that would make it slightly better is moving (as much as possible) the implementation out of the CodeEditor file, since this files seems to grow infinitely all the time

What other people have done is introduced a useAtaManager hook which manages the ata instance

thanks, will do a deeper review

[github-actions]

This PR has been automatically marked as stale because it has had no recent activity. It will be closed if no further activity occurs.