Function getUserColor

getUserColor(userId: string | undefined, palette?: string[]): string
Generate a consistent avatar color based on a userId.
Parameters
- userId: string | undefined
  The user ID to generate a color for
- palette: string[] = DEFAULT_AVATAR_PALETTE
  Array of colors to choose from (defaults to DEFAULT_AVATAR_PALETTE)
Returns string
A color from the palette, deterministic for the same userId
Remarks
Uses a hash function to ensure the same userId always maps to the same color, providing visual consistency across sessions and components.
Example
```
getUserColor('user-123')                    // consistent color from default palette
getUserColor('user-123', ['#f00', '#0f0'])  // consistent color from custom palette
getUserColor(undefined)                     // first color in palette
```
- Defined in packages/utilities/src/avatar.ts:68