When a user does an a Tiqr authentication or enrollment on the device where the Tiqr app is installed the user cannot scan the QR code. Instead the user must open a link by tapping on the QR code. This are no visual or other UI cues that that a user. We want to improve this because with the anti MFA fatigue measures implemented in #316 users will need to login using the QR code more often, especially on mobile for apps that use a webview where the persistent device cookies is not shared.

We want to use the same solution as the eduID.nl uses (i.e. https://github.com/OpenConext/OpenConext-myconext):

1. Detect whether this is a mobile device: https://github.com/OpenConext/OpenConext-myconext/blob/e9b183a37b65762ffa0cabaa0405ec3b41454262/account-gui/src/routes/EnrollApp.svelte#L18

2. Show a "Open the app on this device" / "Open de app op dit apparaat" button under the QR code: https://github.com/OpenConext/OpenConext-myconext/blob/e9b183a37b65762ffa0cabaa0405ec3b41454262/account-gui/src/routes/EnrollApp.svelte#L109-L120

Screenshot of this in action during a mobile login to eduID.nl:

When implementing this take care not to break browsers with limited functionality like those used by desktop apps that use an embedded browser, assume Internet Explorer level functionality.