gui: Ctrl+N new window shortcut + KF5 draft persistence

- Expose GuiActivator as "activator" context property
- Add Ctrl+N shortcut to open a new window (both KF5 and KF6)
- Add per-session draft text persistence to main-kf5.qml
  (KF6 ChatPane.qml already had this from previous commit)

gui/main-kf5.qml

@@ -708,6 +708,12 @@ ApplicationWindow {
         }
     }
 
+    // --- Window shortcuts ---
+    Shortcut {
+        sequence: "Ctrl+N"
+        onActivated: activator.NewWindow()
+    }
+
     // --- Split pane shortcuts ---
     Shortcut {
         sequence: "Ctrl+\\"
@@ -819,6 +825,10 @@ ApplicationWindow {
             property string paneCwd: ""
             property int chatOffset: 0
 
+            // Per-session draft text storage
+            property var _drafts: ({})
+            property string _prevSessionId: ""
+
             Component.onCompleted: {
                 // Create a dedicated ChatBlockModel for this pane
                 paneModel = Qt.createQmlObject(
@@ -844,7 +854,20 @@ ApplicationWindow {
                 }
             }
 
-            onSessionIdChanged: refreshPaneChat()
+            onSessionIdChanged: {
+                // Save draft from previous session
+                if (_prevSessionId !== "") {
+                    _drafts[_prevSessionId] = panePrompt.text
+                }
+                refreshPaneChat()
+                // Restore draft for new session (or empty)
+                if (sessionId !== "") {
+                    panePrompt.text = _drafts[sessionId] || ""
+                } else {
+                    panePrompt.text = ""
+                }
+                _prevSessionId = sessionId
+            }
 
             Connections {
                 target: dbus

gui/main.cpp

@@ -148,6 +148,7 @@ int main(int argc, char *argv[])
     engine.rootContext()->setContextProperty("dbus", dbus);
     engine.rootContext()->setContextProperty("theme", theme);
     engine.rootContext()->setContextProperty("chatModel", chatModel);
+    engine.rootContext()->setContextProperty("activator", &activator);
     engine.rootContext()->setContextProperty("systemTrayAvailable",
         QSystemTrayIcon::isSystemTrayAvailable());
 

gui/main.qml

@@ -529,6 +529,12 @@ ApplicationWindow {
         }
     }
 
+    // --- Window shortcuts ---
+    Shortcut {
+        sequence: "Ctrl+N"
+        onActivated: activator.NewWindow()
+    }
+
     // --- Split pane shortcuts ---
     Shortcut {
         sequence: "Ctrl+\\"