refactor: migrate global styles to injectGlobalStyles

fe-app-podkop/src/helpers/injectGlobalStyles.ts

@@ -0,0 +1,12 @@
+import { GlobalStyles } from '../styles';
+
+export function injectGlobalStyles() {
+  document.head.insertAdjacentHTML(
+    'beforeend',
+    `
+        <style>
+          ${GlobalStyles}
+        </style>
+    `,
+  );
+}