Function execute_switch 

async fn execute_switch(
    app: &AppHandle,
    db: &Arc<RusqliteService>,
    repository_manager: &State<'_, RepositoryManagerWrapper>,
    session_poller: &State<'_, SessionPollerWrapper>,
    from: Option<&str>,
    to: &str,
) -> Result<(), String>

Run a switch plan.

The ordering comes from crate::profiles::switch::plan rather than being written out here, because the ordering is the invariant worth testing and an end-to-end switch needs two real accounts on a real server to exercise.

One step is deliberately not executed here: BuildRepository. Repository handles are created by the frontend (repository_create) because building one needs the token and URL it already assembles at login, so the profile-switched event is the signal to do it. What stays in Rust is the part that matters — that the old handle is destroyed before the active user flips, so nothing can write under the wrong id in between.

TRACES: UR-082 | DR-270