feat(ui): establish shared design system foundations

src/app/ui/App.tsx

@@ -4,8 +4,8 @@ import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import type { FC } from "react";
 import { BrowserRouter } from "react-router";
 import { AppRoutes, RouteErrorBoundary } from "@/app/routes";
-import { theme } from "@/app/theme";
 import { AuthProvider } from "@/features/auth";
+import { cssVariablesResolver, theme } from "@/shared/theme";
 
 const queryClient = new QueryClient({
 	defaultOptions: {
@@ -15,7 +15,11 @@ const queryClient = new QueryClient({
 
 const App: FC = () => {
 	return (
-		<MantineProvider theme={theme} forceColorScheme="light">
+		<MantineProvider
+			cssVariablesResolver={cssVariablesResolver}
+			theme={theme}
+			forceColorScheme="light"
+		>
 			<DatesProvider settings={{ locale: "ru" }}>
 				<QueryClientProvider client={queryClient}>
 					<BrowserRouter>