fix: $form type error when using form fields

packages/forms/src/form/Form.d.ts

@@ -213,7 +213,8 @@ export interface FormSlots {
      * Default content slot.
      * @param {Object} scope - default slot's params.
      */
-    default: (scope: {
+    default: (
+        scope: {
             /**
              * Registers a form field for validation and tracking.
              * @param field - The name of the form field to register.
@@ -229,11 +230,12 @@ export interface FormSlots {
              * Indicates whether the form is valid, returning `true` if all fields pass validation.
              */
             valid: boolean;
+
             /**
-         * Stores the state of each form field, with the field name as the key and its state as the value.
+             * Index signature for dynamically added form fields.
              */
-        states: Record<string, FormFieldState>;
-    }) => VNode[];
+        } & Record<string, FormFieldState>
+    ) => VNode[];
 }
 
 /**