Terminal: the socket's end says itself whether the sign-in was refused

The closing callback gets the End as it is (End::unauthorized), instead of
lib.rs reading the code back out of the JSON sent to the page -- which left
End::unauthorized unused and CI's -D warnings refused the build.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src-tauri/src/lib.rs

@@ -546,18 +546,20 @@ fn terminal_open(
     };
     let url = terminal::url(&app_url, &target, cols, rows)?;
     let h = handle.clone();
-    Ok(app.terminals.open(url, token, move |down| {
-        if down.kind == "end" {
-            h.state::<App>().terminals.forget(down.id);
-            let refused = down.data.get("code").and_then(Value::as_u64)
-                == Some(u64::from(terminal::CLOSE_UNAUTHORIZED))
-                || down.data.get("status").and_then(Value::as_u64) == Some(401);
-            if refused {
-                token_refused(&h);
+    let on_end = handle.clone();
+    Ok(app.terminals.open(
+        url,
+        token,
+        move |down| {
+            let _ = h.emit("terminal", down);
+        },
+        move |id, end| {
+            on_end.state::<App>().terminals.forget(id);
+            if end.unauthorized() {
+                token_refused(&on_end);
             }
-        }
-        let _ = h.emit("terminal", down);
-    }))
+        },
+    ))
 }
 
 /// Keys typed (or pasted) into a terminal, as text: sent to the shell as its bytes.

src-tauri/src/terminal.rs

@@ -167,14 +167,21 @@ pub struct Sessions {
 
 impl Sessions {
     /// Open a terminal's socket on its own thread. `emit` gets every frame, the `end` last;
-    /// the id is the page's handle on it.
-    pub fn open(&self, url: String, token: String, emit: impl Fn(Down) + Send + 'static) -> u64 {
+    /// `ended` is told how it ended just before. The id is the page's handle on it.
+    pub fn open(
+        &self,
+        url: String,
+        token: String,
+        emit: impl Fn(Down) + Send + 'static,
+        ended: impl FnOnce(u64, &End) + Send + 'static,
+    ) -> u64 {
         let id = self.next.fetch_add(1, Ordering::SeqCst) + 1;
         let (tx, rx) = mpsc::channel();
         self.open.lock().unwrap().insert(id, tx);
         std::thread::spawn(move || {
             let send = |kind: &'static str, data: Value| emit(Down { id, kind, data });
             let end = run(&url, &token, &rx, &send);
+            ended(id, &end);
             send("end", serde_json::to_value(&end).unwrap_or(Value::Null));
         });
         id