feat: Add onExportToBackend prop so host can handle it (#2612)

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

src/components/ExportDialog.tsx

@@ -67,7 +67,7 @@ const ExportModal = ({
   onExportToPng: ExportCB;
   onExportToSvg: ExportCB;
   onExportToClipboard: ExportCB;
-  onExportToBackend: ExportCB;
+  onExportToBackend?: ExportCB;
   onCloseRequest: () => void;
 }) => {
   const someElementIsSelected = isSomeElementSelected(elements, appState);
@@ -155,13 +155,15 @@ const ExportModal = ({
                 onClick={() => onExportToClipboard(exportedElements, scale)}
               />
             )}
-            <ToolButton
-              type="button"
-              icon={link}
-              title={t("buttons.getShareableLink")}
-              aria-label={t("buttons.getShareableLink")}
-              onClick={() => onExportToBackend(exportedElements)}
-            />
+            {onExportToBackend && (
+              <ToolButton
+                type="button"
+                icon={link}
+                title={t("buttons.getShareableLink")}
+                aria-label={t("buttons.getShareableLink")}
+                onClick={() => onExportToBackend(exportedElements)}
+              />
+            )}
           </Stack.Row>
           <div className="ExportDialog__name">
             {actionManager.renderAction("changeProjectName")}
@@ -235,7 +237,7 @@ export const ExportDialog = ({
   onExportToPng: ExportCB;
   onExportToSvg: ExportCB;
   onExportToClipboard: ExportCB;
-  onExportToBackend: ExportCB;
+  onExportToBackend?: ExportCB;
 }) => {
   const [modalIsShown, setModalIsShown] = useState(false);
   const triggerButton = useRef<HTMLButtonElement>(null);