Math.Round with C# default banker's rounding (MidpointRounding.ToEven) can
produce counterintuitive results at display-threshold boundaries:
- 59.5 minutes -> Math.Round(59.5) = 60 -> displayed as '60m ago'
instead of '59m ago' (or the correct transition to '1h ago')
- 47.5 hours -> Math.Round(47.5) = 48 -> displayed as '48h ago'
instead of '47h ago' (near the 48h/days boundary)
Using integer truncation ((int)delta.TotalX) matches the idiomatic
convention for age display: show the floor of the elapsed time, which
is consistent, predictable, and never exceeds the guard condition.
Adds three regression tests covering:
- 59.5-minute boundary (was '60m ago', now '59m ago')
- 47.5-hour boundary (was '48h ago', now '47h ago')
- Exactly 60 seconds (correctly '1m ago')
Test status: Shared.Tests 589 passed, 20 skipped; Tray.Tests 122 passed.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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