Function handle_ui_browser_snapshot 

pub(crate) async fn handle_ui_browser_snapshot(
    __arg0: State<AppState>,
    caller: Option<Extension<Caller>>,
    __arg2: Json<UiBrowserSnapshotRequest>,
) -> impl IntoResponse

POST /api/v1/ui/browser/snapshot — backs BrowserSnapshot (docs/specs/SPEC_AGENT_DRIVEN_BROWSER_PANES_2026_10_07.md §4.1).