fix: improve Tauri shell import logic in openExternalUrl function

src/app/utils/tauri.ts

@@ -3,8 +3,10 @@
  * @param url The URL to open
  */
 export const openExternalUrl = async (url: string): Promise<void> => {
-  if (isTauri()) {
+  // Only try to import Tauri shell in Tauri builds
+  if (typeof window !== 'undefined' && (window as any).__TAURI__) {
     try {
+      // @ts-ignore
       const { open } = await import('@tauri-apps/plugin-shell');
       await open(url);
       return;