fix: add HTTP status check before JSON parse

[saurabhhhcodes]

This fix improves error handling to prevent silent failures.

[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

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• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

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• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

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Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
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[Priyanshu-byte-coder]

Closing — this deletes 1,055 lines across three test files (data-export, goals-sync, user-export) while the title claims it adds an HTTP status check. It leaves the files truncated, so Type check fails with TS1003/TS1005. This would wipe out a large part of the test suite.

Please review your own diff before opening a PR, and confirm pnpm type-check && pnpm test pass locally.