fix: export to plus url (#6980)

src/excalidraw-app/components/AppMainMenu.tsx

@@ -26,7 +26,9 @@ export const AppMainMenu: React.FC<{
       <MainMenu.Separator />
       <MainMenu.ItemLink
         icon={PlusPromoIcon}
-        href="https://plus.excalidraw.com/plus?utm_source=excalidraw&utm_medium=app&utm_content=hamburger"
+        href={`${
+          import.meta.env.VITE_APP_PLUS_LP
+        }/plus?utm_source=excalidraw&utm_medium=app&utm_content=hamburger`}
         className="ExcalidrawPlus"
       >
         Excalidraw+

src/excalidraw-app/components/AppWelcomeScreen.tsx

@@ -56,7 +56,9 @@ export const AppWelcomeScreen: React.FC<{
           )}
           {!isExcalidrawPlusSignedUser && (
             <WelcomeScreen.Center.MenuItemLink
-              href="https://plus.excalidraw.com/plus?utm_source=excalidraw&utm_medium=app&utm_content=welcomeScreenGuest"
+              href={`${
+                import.meta.env.VITE_APP_PLUS_LP
+              }/plus?utm_source=excalidraw&utm_medium=app&utm_content=welcomeScreenGuest`}
               shortcut={null}
               icon={PlusPromoIcon}
             >

src/excalidraw-app/components/ExportToExcalidrawPlus.tsx

@@ -69,7 +69,9 @@ export const exportToExcalidrawPlus = async (
   }
 
   window.open(
-    `https://plus.excalidraw.com/import?excalidraw=${id},${encryptionKey}`,
+    `${
+      import.meta.env.VITE_APP_PLUS_APP
+    }/import?excalidraw=${id},${encryptionKey}`,
   );
 };