feat: zen-mode/go-to-plus button style tweaks (#7006)

src/excalidraw-app/components/AppFooter.tsx

@@ -2,6 +2,7 @@ import React from "react";
 import { Footer } from "../../packages/excalidraw/index";
 import { EncryptedIcon } from "./EncryptedIcon";
 import { ExcalidrawPlusAppLink } from "./ExcalidrawPlusAppLink";
+import { isExcalidrawPlusSignedUser } from "../app_constants";
 
 export const AppFooter = React.memo(() => {
   return (
@@ -13,8 +14,11 @@ export const AppFooter = React.memo(() => {
           alignItems: "center",
         }}
       >
-        <ExcalidrawPlusAppLink />
-        <EncryptedIcon />
+        {isExcalidrawPlusSignedUser ? (
+          <ExcalidrawPlusAppLink />
+        ) : (
+          <EncryptedIcon />
+        )}
       </div>
     </Footer>
   );

src/excalidraw-app/index.scss

@@ -77,13 +77,14 @@
   align-items: center;
   border: 1px solid var(--color-primary);
   padding: 0.5rem 0.75rem;
-  border-radius: var(--space-factor);
+  border-radius: var(--border-radius-lg);
+  background-color: var(--island-bg-color);
   color: var(--color-primary) !important;
   text-decoration: none !important;
 
   font-size: 0.75rem;
   box-sizing: border-box;
-  height: var(--default-button-size);
+  height: var(--lg-button-size);
 
   &:hover {
     background-color: var(--color-primary);