add panel titles to mpris/sound/brightness; pin button always visible

modules/Backlight.qml

@@ -109,6 +109,7 @@ M.BarSection {
         anchorItem: root
         accentColor: root.accentColor
         panelNamespace: "nova-backlight"
+        panelTitle: "Brightness"
         contentWidth: 200
 
         Item {

modules/HoverPanel.qml

@@ -268,18 +268,7 @@ PanelWindow {
                     anchors.verticalCenter: parent.verticalCenter
                     width: root.popupMode ? 0 : 20
                     height: 20
-                    visible: !root.popupMode && (root.panelHovered || root._pinned)
-                    opacity: pinHover.hovered || root._pinned ? 1 : 0.35
-
-                    Behavior on opacity {
-                        NumberAnimation {
-                            duration: 100
-                        }
-                    }
-
-                    HoverHandler {
-                        id: pinHover
-                    }
+                    visible: !root.popupMode
 
                     TapHandler {
                         cursorShape: Qt.PointingHandCursor

modules/Mpris.qml

@@ -119,6 +119,7 @@ M.BarSection {
         anchorItem: root
         accentColor: root.accentColor
         panelNamespace: "nova-mpris"
+        panelTitle: "Now Playing"
         contentWidth: 280
 
         // Album art — always 1:1

modules/Volume.qml

@@ -110,6 +110,7 @@ M.BarSection {
         anchorItem: root
         accentColor: root.accentColor
         panelNamespace: "nova-volume"
+        panelTitle: "Sound"
         contentWidth: 220
 
         // Slider row