assistant: notify when a reply ends while the card is closed

A reply streams into the canvas state while the card is closed, but
nothing said when it was done, so working elsewhere meant checking back.
Now a finished or failed turn sends a notification whose Open action
brings the card back on that conversation. A stopped reply does not
notify: stopping it was the user's own act.

notify-send -A blocks until the notification is acted on or dismissed and
prints the picked key, so one Process carries it. A newer reply restarts
that Process and its stack tag replaces the balloon, which drops the
older wait: only the latest reply's Open works.

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

2 files changed, 26 insertions, 0 deletions

diff --git a/desktop/assistant/Assistant.qml b/desktop/assistant/Assistant.qml
index c4d0771..33616ad 100644
--- a/desktop/assistant/Assistant.qml
+++ b/desktop/assistant/Assistant.qml
@@ -405,6 +405,7 @@ Scope {
             }
             if (!e.stopped) root.convId = e.id;
             root.lastActive = Date.now();
+            if (!e.stopped && i >= 0) root.notifyDone(turns.get(i).reply);
             break;
         case "progress": if (root.opDaemon) root.opChars = e.chars; break;
         case "written":
@@ -424,6 +425,7 @@ Scope {
                 root.flush();
                 turns.setProperty(i, "error", e.message);
                 turns.setProperty(i, "live", false);
+                root.notifyDone(e.message);
             } else {
                 root.notice = e.message;
             }
@@ -440,6 +442,27 @@ Scope {
         }
     }
 
+    // A reply that ends while the card is closed says so, and clicking the
+    // notification opens the card on it. notify-send -A waits until the
+    // notification is acted on or dismissed and prints the picked action.
+    // ponytail: one Process, so a newer reply's notification takes over
+    // (the stack tag replaces the balloon, and restarting drops the old wait).
+    function notifyDone(body) {
+        if (root.open) return;
+        notifyProc.command = ["notify-send", "--app-name=Assistant", "--icon=dialog-information",
+                              "-h", "string:x-dunst-stack-tag:assistant", "-A", "default=Open",
+                              "Assistant replied", body.slice(0, 200)];
+        notifyProc.running = false;
+        notifyProc.running = true;
+    }
+
+    Process {
+        id: notifyProc
+        stdout: StdioCollector {
+            onStreamFinished: if (text.trim() === "default") root.show()
+        }
+    }
+
     Timer {
         interval: 50
         repeat: true
diff --git a/desktop/assistant/README.md b/desktop/assistant/README.md
index be95eb7..377796c 100644
--- a/desktop/assistant/README.md
+++ b/desktop/assistant/README.md
@@ -60,6 +60,9 @@ Notes:
   `ServerNotFoundError` warning each time.
 - **`tools` is a comma-joined string role.** A ListModel role holding an
   array becomes a nested model, which `setProperty` cannot append to.
+- **A reply that ends while the card is closed notifies.** Its action,
+  Open, brings the card back on that conversation. A stopped reply does
+  not notify; a failed one does, with the error as its body.
 - **A stopped reply is shown, not kept.** The daemon does not save a
   partial turn, so it is gone after the next reopen or restart.
 - **Only an error marked `turn` ends a reply.** Every client sees every