Undo snackbar disappears too quickly after swipe-to-delete

Checklist

• I have used the search function to see if someone else has already submitted the same bug report.
• I will describe the problem with as much detail as possible.

App

Thunderbird for Android

App version

16.1

Where did you get the app from?

Google Play

Android version

15

Device model

No response

Steps to reproduce

1. go to Inbox
2. swipe an e-mail to the left

Expected behavior

The Undo notification should stay visible for a longer period (e.g., 2-3 seconds, similar to Gmail or other mail clients) to allow enough time for user interaction.

Actual behavior

When deleting an email via swipe gesture, the "Undo" snackbar notification appears for a very short duration (approx. 0.5 - 1 second). This makes it nearly impossible to revert accidental deletions in time.

https://github.com/user-attachments/assets/ec28bfc8-2767-4517-a82b-3912362f65e5

Logs

No response

Start by reproducing the swipe-to-delete flow in the Inbox on Thunderbird for Android 16.1, using the issue’s attached recording as a reference. Trace the snackbar shown after deletion; done means the Undo notification remains available for roughly 2–3 seconds and can reliably restore the message.