Add zero millisecond timesheet formatting test
test/timesheet.test.js only: add one unit test asserting that formatting 0 ms of tracked time yields the same string the existing formatter already returns for zero. No source change.
Outcome
Added a test asserting formatDuration(0) === "0:00:00" in test/timesheet.test.js (no source change). Quick gate green (104/104); PR #10 merged into develop by the merge lane.
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