added backlight and fixed outbound

qml/settings/MainPage.qml

@@ -26,8 +26,22 @@ Item {
         deviceIp = "—"
     }
 
-    Component.onCompleted: refreshIp()
+    function refreshBrightness() {
+        var r = systemInfo.brightnessStatus()
+        if (r.ok) {
+            brightnessSlider.value = r.percent != null ? r.percent : 100
+            brightnessHint.text = "Сейчас: " + r.percent + "%" +
+                (r.device ? (" (" + r.device + ")") : "") +
+                (r.saved != null ? (" · сохранено: " + r.saved + "%") : "")
+        } else {
+            brightnessHint.text = "Подсветка недоступна: " + (r.error || "ошибка")
+        }
+    }
 
+    Component.onCompleted: {
+        refreshIp()
+        refreshBrightness()
+    }
     Timer {
         interval: 5000
         running: true
@@ -101,6 +115,62 @@ Item {
                 onClicked: page.changePassword()
             }
 
+            Rectangle {
+                Layout.fillWidth: true
+                Layout.preferredHeight: brightnessCol.implicitHeight + 16
+                Layout.topMargin: 8
+                radius: 4
+                color: "#2a2a40"
+
+                ColumnLayout {
+                    id: brightnessCol
+                    anchors.left: parent.left
+                    anchors.right: parent.right
+                    anchors.top: parent.top
+                    anchors.margins: 8
+                    spacing: 6
+
+                    Text {
+                        Layout.fillWidth: true
+                        text: "Яркость экрана"
+                        color: "#ffffff"
+                        font.pixelSize: 14
+                        font.bold: true
+                    }
+                    Text {
+                        id: brightnessHint
+                        Layout.fillWidth: true
+                        text: "Загрузка…"
+                        color: "#aaaaaa"
+                        font.pixelSize: 12
+                        wrapMode: Text.WordWrap
+                    }
+                    LabeledSlider {
+                        id: brightnessSlider
+                        Layout.fillWidth: true
+                        label: "Яркость %"
+                        from: 1
+                        to: 100
+                        stepSize: 1
+                        value: 100
+                    }
+                    SettingsButton {
+                        Layout.fillWidth: true
+                        text: "Применить яркость"
+                        onClicked: {
+                            var r = systemInfo.setBrightness(Math.round(brightnessSlider.value))
+                            if (r.ok) {
+                                brightnessHint.text = "Сейчас: " + r.percent + "%" +
+                                    (r.device ? (" (" + r.device + ")") : "") +
+                                    (r.saved != null ? (" · сохранено: " + r.saved + "%") : "")
+                            } else {
+                                brightnessHint.text = "Ошибка: " + (r.error || "неизвестно")
+                            }
+                        }
+                    }
+                }
+            }
+
             Text {
                 Layout.fillWidth: true
                 Layout.topMargin: 8