Function labFromCSSString

labFromCSSString(src: string): LabColor
Parses a CSS Lab color string into a LabColor object.

Supports both comma and space syntax, as well as optional alpha:
- lab(50%, 43.5, -47.3)
- lab(50% 43.5 -47.3)
- lab(50%, 43.5, -47.3, 0.5)
- lab(50% 43.5 -47.3 / 0.5)
The function handles:
- Lightness as a percentage (0-100%)
- A and B components as numbers (can be negative)
- Optional alpha value (0-1 or 0-100%)
- Both comma-separated and space-separated formats
- Whitespace flexibility according to CSS specifications
Parameters
- src: string
  The CSS Lab color string to parse
Returns LabColor
The parsed Lab color object, with lightness normalized to 0-1 range

Throws
If the string format is invalid
- Defined in models/lab/parser.ts:24