fix: numeric median sort + show sub-ms time precision in charts

[stormslowly]

Why

Two small precision fixes for benchmark stats and display:

1. calcStatistics median is wrong for multi-digit values. values.sort() defaults to lexicographic string order, so e.g. [12, 9, 3] sorts to ["12", "3", "9"] and reports median = 3 instead of 9. min/max are unaffected because they use Math.min/Math.max.

2. Chart formatTime truncates ms display to integer. Pairs with rspack fix(stats): preserve sub-millisecond precision in logger time entries rspack#14049 which makes logger.time emit sub-millisecond floats — without this change the chart axis and tooltip would still render 154 ms instead of 154.382 ms, hiding the µs-scale precision the data now carries.

Before / After

calcStatistics([12, 9, 3]).median  →  3       // before
calcStatistics([12, 9, 3]).median  →  9       // after

formatTime(0.019542)               →  "0 ms"     // before
formatTime(0.019542)               →  "0.020 ms" // after