gui: show disconnected state visually, remove session connected/ended messages

- Session list shows '(not connected)' when daemon disconnected
- Chat area shows 'Not connected' placeholder when disconnected
- Message input disabled and shows 'Not connected' when disconnected
- Chat ListView hidden when disconnected
- Remove sessionConnected/streamingDone signals (visual feedback is sufficient)

gui/main.qml

@@ -491,13 +491,6 @@ ApplicationWindow {
             }
             scrollTimer.start()
         }
-        function onSessionConnected() {
-            chatModel.appendData("\n[[[info]]]\nsession connected\n[[[end]]]\n")
-            scrollTimer.start()
-        }
-        function onStreamingDone() {
-            chatModel.appendData("\n[[[info]]]\nsession ended\n[[[end]]]\n")
-        }
     }
 
     // --- Rename Error Dialog ---
@@ -928,14 +921,14 @@ ApplicationWindow {
                 focus: false
                 activeFocusOnTab: false
 
-                // Show placeholder when empty
+                // Show placeholder when empty or disconnected
                 Label {
                     anchors.centerIn: parent
-                    text: "(no sessions)"
+                    text: ollie.daemonConnected ? "(no sessions)" : "(not connected)"
                     color: theme.midColor
                     font.italic: true
                     font.pixelSize: theme.fontSize > 0 ? theme.fontSize * 0.9 : 12
-                    visible: sessionList.count === 0
+                    visible: sessionList.count === 0 || !ollie.daemonConnected
                     activeFocusOnTab: false
                 }
 
@@ -1209,14 +1202,18 @@ ApplicationWindow {
                 Layout.fillHeight: true
                 clip: true
 
-                // Placeholder when no agent selected
+                // Placeholder when no agent selected or disconnected
                 Label {
                     anchors.centerIn: parent
-                    text: ollie.activeSessionId ? "Select an agent to view chat" : "Select a session"
+                    text: {
+                        if (!ollie.daemonConnected) return "Not connected"
+                        if (!ollie.activeSessionId) return "Select a session"
+                        return "Select an agent to view chat"
+                    }
                     color: theme.midColor
                     font.italic: true
                     font.pixelSize: theme.fontSize > 0 ? theme.fontSize : 12
-                    visible: !ollie.activeAgentId
+                    visible: !ollie.activeAgentId || !ollie.daemonConnected
                 }
 
                 ListView {
@@ -1226,7 +1223,7 @@ ApplicationWindow {
                     anchors.fill: parent
                     anchors.margins: 4
                     boundsBehavior: Flickable.StopAtBounds
-                    visible: ollie.activeAgentId !== ""
+                    visible: ollie.daemonConnected && ollie.activeAgentId !== ""
 
                     onCountChanged: {
                         if (count > 0)
@@ -1371,12 +1368,13 @@ property bool blockExpanded: {
                         id: promptInput
                         Layout.fillWidth: true
                         placeholderText: {
+                            if (!ollie.daemonConnected) return "Not connected"
                             if (!ollie.activeSessionId) return "No session"
                             if (!ollie.activeAgentId) return "No agent"
                             if (ollie.isSessionPaused(ollie.activeSessionId)) return "Session paused"
                             return "Message..."
                         }
-                        enabled: ollie.activeSessionId !== "" && ollie.activeAgentId !== "" && !ollie.isSessionPaused(ollie.activeSessionId)
+                        enabled: ollie.daemonConnected && ollie.activeSessionId !== "" && ollie.activeAgentId !== "" && !ollie.isSessionPaused(ollie.activeSessionId)
                         wrapMode: TextEdit.Wrap
 
                         property string _lastText: ""

gui/ollie9pclient.cpp

@@ -45,9 +45,6 @@ Ollie9pClient::Ollie9pClient(QObject *parent)
         if (!data.isEmpty())
             emit chatReceived(QString::fromUtf8(data));
     });
-    connect(m_chat, &StreamFsm::died, this, [this]() {
-        emit streamingDone();
-    });
 
     // State stream — guarded, reads agent statewait. Auto-restarts until
     // session/agent is deselected (guard returns false).
@@ -81,7 +78,6 @@ Ollie9pClient::Ollie9pClient(QObject *parent)
         // Restart streams for the active agent if we have one
         if (!m_activeSessionId.isEmpty() && !m_agentId.isEmpty()) {
             startActiveAgentStreams();
-            emit sessionConnected();
         }
     });
     connect(m_daemon, &NinePConnection::disconnected, this, [this]() {

gui/ollie9pclient.h

@@ -93,8 +93,6 @@ signals:
     void activeStateChanged();
     void agentStateChanged(const QString &sessionId, const QString &agentId, const QString &state);
     void chatReceived(const QString &text);
-    void sessionConnected();
-    void streamingDone();  // chat process exited (session killed)
     void rootBackendsLoadedChanged();
     void availableBackendsChanged();
     void rootAgentsLoadedChanged();