feat(foundry): add map camera spiral controls

packages/ui-react/src/Checker.tsx

@@ -4,14 +4,19 @@ import { cn } from "./cn.js";
 export interface CheckerProps extends Omit<ButtonHTMLAttributes<HTMLButtonElement>, "onChange"> {
   checked: boolean;
   label: string;
-  description?: string;
+  /** Helper copy belongs outside the control, immediately before it. */
+  description?: never;
   onChange: (checked: boolean) => void;
 }
 
+type IsNever<Value> = [Value] extends [never] ? true : false;
+type Assert<Value extends true> = Value;
+type _CheckerDescriptionMustStayForbidden = Assert<IsNever<Exclude<CheckerProps["description"], undefined>>>;
+
 export function Checker({
   checked,
   label,
-  description,
+  description: _unsupportedDescription,
   onChange,
   disabled,
   className,
@@ -32,10 +37,8 @@ export function Checker({
     >
       <span className="nodedc-checker__copy">
         <span className="nodedc-checker__label">{label}</span>
-        {description ? <span className="nodedc-checker__description">{description}</span> : null}
       </span>
       <span className="nodedc-checker__indicator" aria-hidden="true" />
     </button>
   );
 }
-