test: add parseId coverage to smoke tests

[Nityam43]

📝 Summary

Expands the repository's cross-runtime smoke tests to include validation for the parseId function. This ensures that the newest public API is actively exercised in CI across Node.js (both ESM and CJS) and browser environments prior to release.

🛠️ Changes Made

• Updated Test Suites: Added parseId assertions to scripts/smoke.mjs, scripts/smoke.cjs, and scripts/browser-smoke.html.
• Added Core Assertions: Taught the tests to explicitly check three conditions:
  • The Happy Path (Round-trip): Verifies that parsing a valid, generated ID accurately splits it into { prefix, id }.
  • Missing Separator: Ensures string inputs without a separator (e.g., "nosep") safely return undefined.
  • Invalid Input Type: Confirms non-string inputs (e.g., null) are handled safely and return undefined.

✅ Verification

All local tests and CI checks pass cleanly:

• npm run smoke (Validated across Node ESM and CJS)
• npm run verify (Prettier formatting, TypeScript typings, and all CI checks are perfectly green)

Closes #20

[suhailopensource]

@Nityam43 the extra spaces in the PR in smoke file scripts/browser-smoke.html is unecessary . DO remove those . Thank you .

[suhailopensource]

Other than That the Code looks good to me . Thanks. Do star the Repo.

[Nityam43]

Done! I've removed the extra spaces in browser-smoke.html. Let me know if everything looks good now! 🚀

[suhailopensource]

@Nityam43 i also removed the blank lines . instead of sending u for another round.