fix: preserve blank pagination parameters

[kriptoburak]

Summary

• preserve an empty string initialPageParam instead of coercing it to 0
• fix the pagination configuration reported in I'm running into a problem with initialPageParam here. My api expects no or an empty initial page parameter. initialPageParam="" generates code that sends page=0. I believe the reason is that formatOptions => safeParseNumber converts the empty string to 0. #177
• add focused regression coverage for blank numeric parsing and option formatting
• remove the redundant service-specific test as requested in review

Validation

• pnpm build
• pnpm lint
• pnpm test -- --run (71 passed, 1 skipped)
• git diff --check

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[kriptoburak]

Published 1b0de43. The PR now includes the Xquik service-extraction coverage plus the independent #177 pagination fix. Local validation passes: build, Biome, and the full Vitest suite with 72 passed and 1 skipped. The remaining Vercel authorization status requires maintainer approval.

[7nohe]

The empty string handling in safeParseNumber looks good and matches what was reported in #177, thanks. One change I'd like before merging, see the inline comment.

[kriptoburak]

Addressed the requested scope change in 198d0bd: removed the redundant service-specific test and kept only the #177 pagination fix with focused regression coverage. The review thread is resolved. Build, Biome, and all 71 tests pass. The only non-code status is the maintainer-controlled Vercel authorization check. Ready for re-review, @7nohe.

[kriptoburak]

Closing this because the maintainer-requested scope now intentionally contains no Xquik placement. The accepted generic pagination fix should remain a separately scoped upstream contribution if the maintainer wants it, but this branch no longer serves the Xquik integration goal. Thanks for the detailed review.