[Feature][Mobile] Settle the current thread and return to the thread list #16505

Problem

When I finish reading a conversation in the T3 Code mobile app, I want to settle it directly from the open thread and return to the thread list. Having to leave the conversation first and then find the same thread in the list adds friction to a simple "I'm done with this" action.

The interaction I have in mind is Gmail's archive action inside an open email conversation: tap the action, and you're back in the inbox, ready to pick the next item.

Requested behavior

1. Open a thread in the mobile app.
2. Tap Settle from the current thread view.
3. Once settlement succeeds, automatically return to the thread list.

A button in the thread header would make this easy to reach. An action in the thread's overflow menu would also work; the exact placement is open to maintainer preference.

Please use the existing Settle behavior. The Gmail analogy describes the interaction, rather than requesting T3's separate Archive action. The conversation should remain accessible through the existing settled-thread flow.

If settlement fails, stay in the conversation and show the error.

Related

#16090 describes a related navigation problem after settling on web/desktop. This request is specifically for an action in the mobile conversation view that returns to the thread list.