test(svg): export and add tests for deterministicRandom() helper

[prachimaskar]

Description

Fixes #342

Exported the deterministicRandom helper function and added 3 unit tests as required by the issue:

• Same seed always returns the same value (determinism)
• Result is always in the range [0, 1)
• Different seeds return different values

All 113 tests pass (110 existing + 3 new).

Pillar

• 🛠️ Other (Bug fix, refactoring, docs)

Visual Preview

No SVG changes — test-only addition. No visual output is affected.

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally.
• I have run npm run format and npm run lint locally and resolved all errors.
• My commits follow the Conventional Commits format.
• I have updated README.md if I added a new theme or URL parameter.
• I have starred the repo.
• I have made sure that i have only one commit to merge in this PR.
• The SVG output matches the CommitPulse "premium quality" aesthetic standard.

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[github-actions]

👋 Hey @prachimaskar, welcome to CommitPulse! 🎉

Thanks for opening your first pull request — this is a big deal and we appreciate the effort!

While you wait for a review, please double-check:

• ✅ You've read the CONTRIBUTING.md checklist
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[Aamod007]

Exports deterministicRandom and adds 3 unit tests: same seed returns same value, result in [0, 1), different seeds differ. 113/113 tests pass. Clean.

[github-actions]

🎉 Congratulations @prachimaskar! Your PR has been successfully merged. 🚀

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