Migrate to Mantine v8 and Design Changes (#961)

* mantine v8 migration

* various design changes and improvements

src/shared/components/portal/portal.tsx

@@ -0,0 +1,7 @@
+import { Portal as MantinePortal, PortalProps as MantinePortalProps } from '@mantine/core';
+
+export interface PortalProps extends MantinePortalProps {}
+
+export const Portal = ({ children, ...props }: PortalProps) => {
+    return <MantinePortal {...props}>{children}</MantinePortal>;
+};