Add unit tests for utilities

[elamperti]

Summary

• add coverage for formatScrobbleTimestamp
• test Amazon referral links helper
• add localStorage helper tests
• cover alert reducer and scrobble transformer
• add tests for user and settings transformers

Testing

• yarn test:unit

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https://chatgpt.com/codex/tasks/task_e_684054739a188328b6f4aa5ac9c2e198

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 20.81%. Comparing base (1886dac) to head (acecdd3).
Report is 2 commits behind head on main.

Additional details and impacted files

see 16 files with indirect coverage changes

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[cypress]

Open Scrobbler    Run #56

Run Properties:   Passed #56  •  7bad308c7e ℹ️: Merge acecdd323b544f46939347a8b7eeecf6a86c536a into 50b2b49aeea23956e877cfbe825b...

Project	Open Scrobbler
Branch Review	codex/add-unit-tests-with-real-data
Run status	Passed #56
Run duration	02m 38s
Commit	7bad308c7e ℹ️: Merge acecdd323b544f46939347a8b7eeecf6a86c536a into 50b2b49aeea23956e877cfbe825b...
Committer	Enrico Lamperti
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	3
Skipped	0
Passing	74
View all changes introduced in this branch ↗︎