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/excalidraw-app/components/EncryptedIcon.tsx

@@ -0,0 +1,17 @@
+import { shield } from "../../components/icons";
+import { Tooltip } from "../../components/Tooltip";
+import { t } from "../../i18n";
+
+export const EncryptedIcon = () => (
+  <a
+    className="encrypted-icon tooltip"
+    href="https://blog.excalidraw.com/end-to-end-encryption/"
+    target="_blank"
+    rel="noopener noreferrer"
+    aria-label={t("encrypted.link")}
+  >
+    <Tooltip label={t("encrypted.tooltip")} long={true}>
+      {shield}
+    </Tooltip>
+  </a>
+);

src/excalidraw-app/components/ExcalidrawPlusAppLink.tsx

@@ -0,0 +1,17 @@
+import { isExcalidrawPlusSignedUser } from "../../constants";
+
+export const ExcalidrawPlusAppLink = () => {
+  if (!isExcalidrawPlusSignedUser) {
+    return null;
+  }
+  return (
+    <a
+      href={`${process.env.REACT_APP_PLUS_APP}?utm_source=excalidraw&utm_medium=app&utm_content=signedInUserRedirectButton#excalidraw-redirect`}
+      target="_blank"
+      rel="noreferrer"
+      className="plus-button"
+    >
+      Go to Excalidraw+
+    </a>
+  );
+};