"Deny"/"Allow" buttons inaccessible in an "Access request" popup

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**Describe the bug**
I got three popups, requesting access to Gmail, Calendar, and Keep Notes from my work Google account. However, the actual "Deny" and "Allow" buttons are completely hidden by the Android navigation bar, so they are impossible to click. I finally got around it by using landscape mode.

**To Reproduce**
(This is what I did; not sure if e.g. SSO has anything to do with the bug.)
Steps to reproduce the behavior:
1. Use SSO for a Google account
2. Change the SSO provider password, which requires the Google account to be re-connected
3. Try to click "Deny" or "Allow" in the access request notification

**Expected behavior**
The access request's UI should completely fit inside of the window

**Screenshots**

**System**
Android Version: 16
Custom ROM: LineageOS 23.2-20260804-NIGHTLY-dodge

**Additional context**
I'm assuming this is a MicroG bug since it involves a Google account - but I guess this could also be a LineageOS bug.

Start by reproducing the access request popup on Android 16 with the SSO reconnection steps described, including portrait and landscape modes. Trace the popup's window and navigation-bar handling, while considering whether the behavior belongs to MicroG or LineageOS. Done means the Deny and Allow buttons are visible and clickable within the window.

Written by the indexing model from the issue text.