Function formatDuration

formatDuration(seconds: number): string
Format duration in seconds to a display string (MM:SS or HH:MM:SS).
Parameters
- seconds: number
  Duration in seconds
Returns string
Formatted duration string
Example
```
formatDuration(65);   // "1:05"
formatDuration(3661); // "1:01:01"
```
- Defined in streaming/hooks.ts:65