refactor: Enhance docs, code, add tests in `HappyNumbersSeq` #6644

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Hardvan wants to merge 6 commits into TheAlgorithms:master from Hardvan:happy-improve

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refactor: Enhance docs, code, add tests in `HappyNumbersSeq` #6644

Merge branch 'master' into happy-improve

GitHub Advanced Security / CodeQL succeeded Oct 12, 2025 in 3s

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