Rework auth flow.

Acceptance criteria

1. Hide "Authorize with Vereign" button by default. Show button only when Vereign was launched from third party app with authorization request.
2. If authorization successful, redirect to Third party app immediately without showing "Authorization success" modal.
3. If authorization fails, show error message with "Open Dashboard" button.
4. If user cancel authorization flow:

• [Android] - redirect him automatically to the Dashboard.
• [iOS] - do not redirect to Dashboard and show buttons "Open Dashboard" and "Authorize with Vereign"