refactor(web_ui): Bus::effective_context_window, sigint_claude + per-connection hello, relocate fetch_reminder_stats, drop redundant guard

hive-ag3nt/src/web_ui/actions.rs

@@ -44,10 +44,7 @@ pub(super) async fn post_send(
 }
 
 pub(super) async fn post_cancel_turn(State(state): State<AppState>) -> Response {
-    let out = tokio::process::Command::new("pkill")
-        .args(["-INT", "claude"])
-        .output()
-        .await;
+    let out = super::sigint_claude().await;
     let note = match out {
         Ok(o) if o.status.success() => "operator: /cancel — sent SIGINT to claude".to_owned(),
         Ok(o) if o.status.code() == Some(1) => {