feat: add getCookieOptions utility function

[dtoxvanilla1991]

Explain your changes

• Built framework-agnostic getCookieOptions with explicit typing, optional env injection, and warnings when runtime config is incomplete.
• Added whitespace handling and diagnostic logs so malformed cookie domains or missing NODE_ENV don’t slip through silently.
• Wrote targeted Vitest coverage for defaults, overrides, runtime fallbacks, warnings, and removeTrailingSlash edge cases; all tests pass.

Checklist

• I have read the “Pull requests” section in the contributing guidelines.
• I agree to the terms within the code of conduct.

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[codecov]

Codecov Report

❌ Patch coverage is 96.82540% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
lib/utils/getCookieOptions.ts	96.77%	2 Missing ⚠️

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