feat: render footer as a component instead of render prop (#5970)

* feat: render footer as a component instead of render prop

* Export FooterCenter as footer

* remove useDevice export

* revert some changes

* remove

* add spec

* update specs

* parse children into a dictionary

* factor app footer components into a single file

* Add docs

* split app footer components

Co-authored-by: dwelle <luzar.david@gmail.com>

src/components/WelcomeScreen.tsx

@@ -2,7 +2,7 @@ import { useAtom } from "jotai";
 import { actionLoadScene, actionShortcuts } from "../actions";
 import { ActionManager } from "../actions/manager";
 import { getShortcutFromShortcutName } from "../actions/shortcuts";
-import { COOKIES } from "../constants";
+import { isExcalidrawPlusSignedUser } from "../constants";
 import { collabDialogShownAtom } from "../excalidraw-app/collab/Collab";
 import { t } from "../i18n";
 import { AppState } from "../types";
@@ -15,10 +15,6 @@ import {
 } from "./icons";
 import "./WelcomeScreen.scss";
 
-const isExcalidrawPlusSignedUser = document.cookie.includes(
-  COOKIES.AUTH_STATE_COOKIE,
-);
-
 const WelcomeScreenItem = ({
   label,
   shortcut,