Function validateColor

validateColor(
color: unknown,
options?: ValidatorOptions,
): { valid: boolean; error: string | null }
Validates a CSS colour.

Three literal forms are recognised without help — #RGB/#RRGGBB, rgb() and rgba(). Everything else (named colours, hsl(), modern syntaxes) is delegated to CSS.supports("color", …).

⚠️ That fallback is browser-only. Where CSS is undefined — Node, SSR, a bare test runner — "red" and "hsl(120, 100%, 50%)" are reported invalid, while the three literal forms keep working. A colour validated server-side is therefore not validated by the same rule as one validated in the page.
Parameters
- color: unknown
  Value to check; anything that is not a non-empty string fails.
- options: ValidatorOptions = {}
  See ValidatorOptions.
Returns { valid: boolean; error: string | null }
{ valid, error }; error is null when valid.
Throws
GeoLeafError A ValidationError when invalid and throwOnError is set.
Example
```
GeoLeaf.Validators.validateColor("#ff0000"); // valide
GeoLeaf.Validators.validateColor("rgb(255, 0, 0)"); // valide
GeoLeaf.Validators.validateColor("rgba(0,0,0,0.5)"); // valide
GeoLeaf.Validators.validateColor("red"); // valide en navigateur (CSS.supports)
GeoLeaf.Validators.validateColor("hsl(120, 100%, 50%)"); // valide en navigateur
GeoLeaf.Validators.validateColor("#gggggg"); // invalide
```
- Defined in src/utils/validators/general-validators.ts:605