It's odd to me that the nice large thread envelope icon itself isn't a click target.
This one:
View attachment 9056
I'd like to see that become clickable and perform the "goto first new post" action. That should be easy enough to hit on all devices, and wouldn't add any additional space.
I'd second that if possible. Thanks woof for the icons. The big one would be nice, but anything bigger would be a huge improvement.