ask_operator tool: non-blocking; operator answer arrives as helper event

new mcp tool on the manager surface that queues a question on the
dashboard and returns the question id immediately. operator submits an
answer via /answer-question/<id>; the dashboard fires
HelperEvent::OperatorAnswered { id, question, answer } into the manager
inbox so the next turn picks it up.

also: fix async-form button stuck on spinner after successful submit
(refreshState skipped re-rendering, so the button was never re-enabled).

hive-ag3nt/src/bin/hive-m1nd.rs

@@ -170,7 +170,11 @@ async fn serve(socket: &Path, interval: Duration, bus: Bus) -> Result<()> {
                 turn::emit_turn_end(&bus, &outcome);
             }
             Ok(ManagerResponse::Empty) => {}
-            Ok(ManagerResponse::Ok | ManagerResponse::Status { .. }) => {
+            Ok(
+                ManagerResponse::Ok
+                | ManagerResponse::Status { .. }
+                | ManagerResponse::QuestionQueued { .. },
+            ) => {
                 tracing::warn!("recv produced unexpected response kind");
             }
             Ok(ManagerResponse::Err { message }) => {
@@ -184,7 +188,6 @@ async fn serve(socket: &Path, interval: Duration, bus: Bus) -> Result<()> {
     }
 }
 
-
 /// Per-turn user prompt. The role/tools/etc. is in the system prompt
 /// (`prompts/manager.md` → `claude --system-prompt-file`); this is just
 /// the wake signal. `unread` is the inbox depth after this message was
@@ -193,7 +196,9 @@ fn format_wake_prompt(from: &str, body: &str, unread: u64) -> String {
     let pending = if unread == 0 {
         String::new()
     } else {
-        format!("\n\n({unread} more message(s) pending in your inbox — drain via `mcp__hyperhive__recv` if relevant.)")
+        format!(
+            "\n\n({unread} more message(s) pending in your inbox — drain via `mcp__hyperhive__recv` if relevant.)"
+        )
     };
     format!("Incoming message from `{from}`:\n---\n{body}\n---{pending}")
 }