Fix CommonJS/TypeScript constructor interop in deque + heap sort

[loiane]

Summary

• fix Deque import handling in src/05-queue-deque/palindrome-checker.js to support both CommonJS and transpiled default-export module shapes
• fix Comparator import handling in src/11-heap/heap-sort.js with the same compatibility pattern
• preserve existing module APIs while eliminating runtime TypeError: ... is not a constructor failures

Why

Some modules are transpiled with exports.default, while these consumers expected direct CommonJS constructor exports. That mismatch caused failing queue/deque and heap-sort test suites.

Validation

• affected tests now pass:
  • src/05-queue-deque/__test__/algorithms.test.js
  • src/05-queue-deque/__test__/algorithms.test.ts
  • src/11-heap/__test__/heap-sort.test.js
  • src/11-heap/__test__/heap-sort.test.ts
• TypeScript build succeeds (npm run build:ts)