Function getContrastingTextColor

getContrastingTextColor(hexBackgroundColor: string): string
Determines a contrasting text color (black or white) based on background luminance.
Parameters
- hexBackgroundColor: string
  The background color in hex format.
Returns string
'#000000' (black) or '#FFFFFF' (white).
Example
```
const textColor = getContrastingTextColor('#FF0000'); // Returns '#FFFFFF'
```
- Defined in utils/avatar.ts:65