Fix: Add overflow to changes list section of unsynchronized confirmation dialog

[fluiddot]

Fix

Fixes #2716

This PR adds overflow to the changes list section of the unsynchronized confirmation dialog, this will enable scroll if the list is too long while keeping the action buttons visible.

unsynchronized-dialog-overflow.mp4

Test

1. Go offline to prevent saving notes.
2. Create 10 or more notes.
3. Make the window height as small as possible.
4. Exit the application.
5. Observe that the unsynchronized confirmation dialog displays all the content and that the changes list is scrollable.

Release

N/A

[sandymcfadden]

This makes that the unsynced notes screen much nicer. Thank you.

I did leave a question on the related PR about the use of interpolation for the sass variable which is used here as well.