test: add node:test coverage for pitch naming and chart-event cursoring

[OmikronApex]

Nineteenth repo from the org test-coverage audit. The module.exports hook sits right before the bootstrap block (window/document event listener registration + ensureButton()), after every helper function declaration.

11 tests:

• stringFretToName: standard 6-string guitar open strings, tuning-offset + capo math, bass-arrangement detection (4-string), 7-string guitar / 5-string bass via tuning-array length, out-of-range string index → ?
• rebuildChartEvents: merges notes + chords into one time-sorted list, drops muted notes and muted chord members (and chords left with zero members), tolerates a missing highway global
• resetCursor: binary-searches to the first event at/after the current audio time
• findNextEvent: RAF-hitch tolerance window (a big time jump doesn't silently skip the very next event), returns null once the cursor runs past the end of the chart

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📥 Commits

Reviewing files that changed from the base of the PR and between 2013f79 and 8120cab.

📒 Files selected for processing (2)

• screen.js
• tests/screen.test.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-basic-tests

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