ACP loadSessionMode doesn't set model and mode #9828

Description

First of all, sorry.. I've implemented a wrong fix to #7804 in #7809.

That fix correctly retrieves the model and mode from the last message, and returns them in the load response, but it fails to actually set the model and mode in the session - resulting in the session still using the default model.

What needs to be done - use setModel and setMode right after they are retrieved from the message

Plugins

No response

OpenCode version

v1.1.26

Steps to reproduce

1. Start a session, set model to non-default, send a message
2. Load the session.
3. Load session will return (correctly) non-default model in response
4. Send a message
5. Message is sent to default model

Screenshot and/or share link

No response

Operating System

macOS 15.6.1

Terminal

Ghostty