Revert "fix: layer mobile widget details above header"

This reverts commit a540f07920.

packages/ui/src/theme/modal.ts

@@ -1,7 +1,5 @@
 import type { MantineTheme, MantineThemeComponent, ModalProps } from "@mantine/core";
 
-import { modalZIndex } from "./layers";
-
 export const modalSizeSelect = "xxl";
 export const modalSizeForm = "lg";
 
@@ -10,9 +8,6 @@ const fixedModalSizes = new Set([modalSizeSelect, modalSizeForm]);
 const modalWidth = "min(var(--modal-size), calc(100vw - 2 * var(--mantine-spacing-md)))";
 
 export const modalComponent: MantineThemeComponent = {
-  defaultProps: {
-    zIndex: modalZIndex,
-  },
   vars: (_theme: MantineTheme, props: Partial<ModalProps>) => {
     if (props.size === modalSizeSelect) {
       return { root: { "--modal-size": "75rem" } };