fix(table): sort enrolled employees first

[svadrutk]

Summary

• order true boolean sort values before false in ascending table sorts
• preserve the inverse ordering for descending sorts
• add regression coverage for enrolled versus unenrolled employees

Test plan

• pnpm test -- --run src/components/Table/sorting.test.ts (68 tests passed)
• pnpm type-check
• pnpm lint

Linear Issue: S-503

  

[linear-code]

S-503

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}