feat: Add summarize chat (#289)

ChatView/qml/RootItem.qml

@@ -88,9 +88,12 @@ ChatRootView {
             Layout.preferredWidth: parent.width
             Layout.preferredHeight: childrenRect.height + 10
 
+            isCompressing: root.isCompressing
             saveButton.onClicked: root.showSaveDialog()
             loadButton.onClicked: root.showLoadDialog()
             clearButton.onClicked: root.clearChat()
+            compressButton.onClicked: compressConfirmDialog.open()
+            cancelCompressButton.onClicked: root.cancelCompression()
             tokensBadge {
                 text: qsTr("%1/%2").arg(root.inputTokensCount).arg(root.chatModel.tokensThreshold)
             }
@@ -499,6 +502,22 @@ ChatRootView {
         scrollToBottom()
     }
 
+    Dialog {
+        id: compressConfirmDialog
+
+        anchors.centerIn: parent
+        title: qsTr("Compress Chat")
+        modal: true
+        standardButtons: Dialog.Yes | Dialog.No
+
+        Label {
+            text: qsTr("Create a summarized copy of this chat?\n\nThe summary will be generated by LLM and saved as a new chat file.")
+            wrapMode: Text.WordWrap
+        }
+
+        onAccepted: root.compressCurrentChat()
+    }
+
     Toast {
         id: errorToast
         z: 1000