Fix response possibly undefined TS error

[rgllm]

Currently the project does not build due to a TS error because response is possible undefined on manager.fetch, this PR fixes the issue.

[kuba-orlik]

@rgllm, thanks for the heads-up! I tried to build the project using the latest main branch and I don't see any errors during npm run build or npm run typecheck. Could you provide some more details on what error did you see, where and when?

[rgllm]

@rgllm, thanks for the heads-up! I tried to build the project using the latest main branch and I don't see any errors during npm run build or npm run typecheck. Could you provide some more details on what error did you see, where and when?

Sorry, I should have added more details about my env. It's only happening with pnpm, all good with npm for me too.

pnpm 10.3.0
node 22.14.0