feat(opener): add inAppBrowser option for iOS and Android (#2803)

plugins/opener/guest-js/index.ts

@@ -35,12 +35,14 @@ import { invoke } from '@tauri-apps/api/core'
  *
  * @param url The URL to open.
  * @param openWith The app to open the URL with. If not specified, defaults to the system default application for the specified url type.
+ * On mobile, `openWith` can be provided as `inAppBrowser` to open the URL in an in-app browser. Otherwise, it will open the URL in the system default browser.
  *
  * @since 2.0.0
  */
 export async function openUrl(
   url: string | URL,
-  openWith?: string
+  // eslint-disable-next-line @typescript-eslint/no-redundant-type-constituents
+  openWith?: 'inAppBrowser' | string
 ): Promise<void> {
   await invoke('plugin:opener|open_url', {
     url,