[Mobile]: Let me turn off (or remove) the "Settled thread" undo notification #26533

Before submitting

• I searched existing issues and did not find a duplicate. [Bug]: Oversized "Settled thread" notification covers the thread list on iPhone #24242 made this notification smaller and moved it to the bottom, but it didn't ask whether the notification should exist at all.

Area

apps/mobile

Problem or use case

Every time I settle a thread on mobile, a "Settled thread" notification with an Undo button pops over the thread list. It doesn't tell me anything. I just swiped the thread away and watched it leave the list, so the confirmation repeats what I already saw. In practice it just covers threads I'm trying to read and gets in the way of the next swipe.

Honestly it feels like vibecoded slop: a default "destructive actions need undo" pattern that got added without anyone checking whether settling is destructive. It isn't. A settled thread is still there and can be unsettled from the settled list.

Proposed solution

Any of these would work, in order of preference:

1. Remove the notification for settle on mobile. The row animating out is enough feedback, and settled threads can already be unsettled.
2. Add a setting to turn off undo notifications for settle (and snooze/archive, if they show the same notice).
3. If undo has to stay, make it something that doesn't cover content: a short haptic plus a small inline "Undo" on the list, or shake-to-undo like the rest of iOS.

Why this matters

Settling is something you do many times in a row while you triage. A notification on every settle adds noise to the most common action in the thread list.

Smallest useful scope

A setting that turns off the "Settled thread" notification on mobile.

Version or commit

Mobile app 2.1 (iPhone)