fix(core): adjust NgtAttachable type to accept string | number array (for index)

Author: nartc

libs/core/src/lib/types.ts

@@ -191,7 +191,10 @@ export type NgtAttachFunction<TChild = any, TParent = any> = (
 	store: NgtSignalStore<NgtState>,
 ) => void | (() => void);
 
-export type NgtAttachable<TChild = any, TParent = any> = NgtAttachFunction<TChild, TParent> | string | string[];
+export type NgtAttachable<TChild = any, TParent = any> =
+	| NgtAttachFunction<TChild, TParent>
+	| string
+	| (string | number)[];
 
 export interface NgtAfterAttach<
 	TChild extends NgtInstanceNode = NgtInstanceNode,