fix context menu: kill target session, not active one

Right-click now stores the target session ID in a root-level
property (killTargetSessionId) before popping the menu, avoiding
unreliable QML parent chain traversal that could resolve to the
wrong delegate.

gui/main.qml

@@ -90,6 +90,9 @@ ApplicationWindow {
         onTriggered: chatView.positionViewAtEnd()
     }
 
+    // Session ID to kill — set on right-click, consumed by context menu
+    property string killTargetSessionId: ""
+
     // Session tree model — flat list with level info
     ListModel {
         id: sessionTreeModel
@@ -538,6 +541,9 @@ ApplicationWindow {
                         onClicked: function(mouse) {
                             if (mouse.button === Qt.RightButton) {
                                 if (type === "session") {
+                                    var item = sessionTreeModel.get(parent.modelIndex)
+                                    if (item)
+                                        root.killTargetSessionId = item.id
                                     sessionCtxMenu.popup()
                                 }
                                 return
@@ -561,9 +567,8 @@ ApplicationWindow {
                                 text: "Kill"
                                 icon.color: "#f44336"
                                 onClicked: {
-                                    var item = sessionTreeModel.get(parent.parent.parent.modelIndex)
+                                    if (root.killTargetSessionId)
-                                    if (item && item.type === "session")
+                                        ollie.killSession(root.killTargetSessionId)
-                                        ollie.killSession(item.id)
                                     ollie.refreshSessions()
                                 }
                             }