## Remove all Recoil references and replace with Jotai
### Summary
- Removed every occurrence of Recoil from the entire codebase, replacing
with Jotai equivalents where applicable
- Updated `README.md` tech stack: `Recoil` → `Jotai`
- Rewrote documentation code examples to use
`createAtomState`/`useAtomState` instead of `atom`/`useRecoilState`, and
removed `RecoilRoot` wrappers
- Cleaned up source code comment and Cursor rules that referenced Recoil
- Applied changes across all 13 locale translations (ar, cs, de, es, fr,
it, ja, ko, pt, ro, ru, tr, zh)
