feat: refactor openExternalUrl to use dedicated Tauri shell utility

src/app/utils/tauriShell.ts

@@ -0,0 +1,9 @@
+/**
+ * Tauri shell open utility, only imported in Tauri builds
+ */
+
+export async function openWithTauriShell(url: string): Promise<void> {
+  // @ts-ignore
+  const { open } = await import(/* @vite-ignore */ '@tauri-apps/plugin-shell');
+  await open(url);
+}