Function formatDuration

formatDuration(ms: number): string
Format a duration in milliseconds to a human-readable string.
Parameters
- ms: number
  Duration in milliseconds
Returns string
Formatted duration string (e.g., "150ms", "2.5s", "1m 30s")
Example
```
formatDuration(150); // "150ms"
formatDuration(2500); // "2.5s"
formatDuration(90000); // "1m 30s"
```
- Defined in lib/formatters.ts:142