Boursobank hangs on loading screen, apparently around Play Integrity after authent

**Describe the bug**

I cannot log in to the Boursobank app.

**To Reproduce**

1. Install Boursobank via Aurora Store.
2. Enter my ID.
3. Enter my password.
4. The app remains stuck on the loading screen indefinitely.

**Expected behavior**

I should be logged in and taken to my account.

**Screenshots**

**System**
Android version: 15
Custom ROM: LineageOS 22.2
Device: OnePlus 6T
microG Core version: 0.3.16.252432
microG Self-Check results: All ticked
Boursobank version: 7.74.1

**Additional context**

I also tried disabling microG as recommended [here](https://community.e.foundation/t/list-banking-apps-on-e-os/33091/481)

However, this does not work for me, because I don't get the option to "go to website" to log in.

One thing that caught my attention is that the app requests a Play Integrity token shortly after startup, and later calls requestAndShowDialog(). The app remains stuck on the loading screen afterwards.

There is also an nfc_manager exception in the log, although I don't know whether it is related to the issue.

Here is the relevant adb logcat --pid=12668 output. I've removed some irrelevant information from the log for readability and privacy.

```
08-25 19:33:06.849 I FirebaseCrashlytics: Initializing Firebase Crashlytics
08-25 19:33:06.874 I FirebaseInitProvider: FirebaseApp initialization successful

08-25 19:33:06.931 I flutter: [IMPORTANT:flutter/shell/common/shell.cc(527)] [Action Required]: Impeller opt-out deprecated.
08-25 19:33:06.931 I flutter: The application opted out of Impeller.

08-25 19:33:06.991 E GeneratedPluginRegistrant: Error registering plugin nfc_manager, dev.flutter.plugins.nfcmanager.NfcManagerPlugin
08-25 19:33:06.991 E GeneratedPluginRegistrant: java.lang.NullPointerException: Attempt to invoke virtual method
08-25 19:33:06.991 E GeneratedPluginRegistrant: 'java.util.Iterator android.content.IntentFilter.actionsIterator()'
08-25 19:33:06.991 E GeneratedPluginRegistrant: on a null object reference
08-25 19:33:06.991 E GeneratedPluginRegistrant: at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1936)
08-25 19:33:06.991 E GeneratedPluginRegistrant: at android.app.ContextImpl.registerReceiver(ContextImpl.java:1872)
08-25 19:33:06.991 E GeneratedPluginRegistrant: at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:784)
08-25 19:33:06.991 E GeneratedPluginRegistrant: at qc.y.onAttachedToActivity(...)
08-25 19:33:06.991 E GeneratedPluginRegistrant: at io.flutter.plugins.GeneratedPluginRegistrant.registerWith(...)
08-25 19:33:06.991 E GeneratedPluginRegistrant: at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1706)
08-25 19:33:06.991 E GeneratedPluginRegistrant: at android.app.Activity.performStart(Activity.java:9122)
08-25 19:33:06.991 E GeneratedPluginRegistrant: at android.app.ActivityThread.handleStartActivity(ActivityThread.java:4231)

08-25 19:33:07.021 I flutter: [start app in Environment{...}] with native mode release

08-25 19:33:07.834 I DynamiteModule: Considering local module com.google.android.gms.cronet_dynamite:0 and remote module com.google.android.gms.cronet_dynamite:2
08-25 19:33:07.834 I DynamiteModule: Selected remote version of com.google.android.gms.cronet_dynamite, version >= 2

08-25 19:33:08.377 I cr_CronetLibraryLoader: Cronet version: 102.0.5005.125, arch: aarch64

08-25 19:33:08.609 I PlayCore: IntegrityService: requestIntegrityToken(...)
08-25 19:33:08.625 I PlayCore: IntegrityService: ServiceConnectionImpl.onServiceConnected(...)
08-25 19:33:11.163 I PlayCore: OnRequestIntegrityTokenCallback: onRequestIntegrityToken
08-25 19:33:11.163 I PlayCore: IntegrityService: Unbind from service.

08-25 19:33:13.349 I flutter: Contentsquare Flutter SDK starting

08-25 19:33:13.365 W FA: User ID must be non-empty or null

08-25 19:33:16.969 I android.clients: Background concurrent copying GC freed memory

08-25 19:33:30.577 I PlayCore: IntegrityService: requestAndShowDialog(...)

08-25 19:34:21.600 I TRuntime.CctTransportBackend: Making request to Firebase logging service
08-25 19:34:23.963 I TRuntime.CctTransportBackend: Status Code: 200

08-25 19:34:29.244 D SessionLifecycleClient: Sending lifecycle 2 to service
08-25 19:34:29.244 D SessionLifecycleService: Activity backgrounding

```

No source file or test is named. Start by tracing the Play Integrity requestIntegrityToken and requestAndShowDialog calls referenced in the logcat, then compare their behavior with the login flow; done means identifying the cause of the indefinite loading screen and verifying that login completes.

Written by the indexing model from the issue text.