The I/O columns (Disk Read, Disk Write, Net In, Net Out) were showing
static gray text regardless of throughput values. This restores the
visual intensity scaling that was lost during the responsive table
refactor, where higher throughput values appear bolder/brighter to
draw attention to active I/O.
Thresholds:
- < 1 MB/s: dim gray
- 1-10 MB/s: normal gray
- 10-50 MB/s: medium weight, slightly brighter
- > 50 MB/s: semibold, white/black
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