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/constants.ts

@@ -243,3 +243,7 @@ export const COOKIES = {
 /** key containt id of precedeing elemnt id we use in reconciliation during
  * collaboration */
 export const PRECEDING_ELEMENT_KEY = "__precedingElement__";
+
+export const isExcalidrawPlusSignedUser = document.cookie.includes(
+  COOKIES.AUTH_STATE_COOKIE,
+);