qml: some styling fixes

electrum/gui/qml/components/Channels.qml

@@ -19,7 +19,7 @@ Pane {
 
         GridLayout {
             id: summaryLayout
-            Layout.fillWidth: true
+            Layout.preferredWidth: parent.width
             Layout.topMargin: constants.paddingLarge
             Layout.leftMargin: constants.paddingLarge
             Layout.rightMargin: constants.paddingLarge

electrum/gui/qml/components/Constants.qml

@@ -33,6 +33,7 @@ Item {
     property color colorError: '#ffff8080'
     property color colorLightningLocal: "blue"
     property color colorLightningRemote: "yellow"
+    property color colorChannelOpen: "#ff80ff80"
 
     property color colorPiechartOnchain: Qt.darker(Material.accentColor, 1.50)
     property color colorPiechartFrozen: 'gray'

electrum/gui/qml/components/controls/ChannelDelegate.qml

@@ -68,7 +68,11 @@ ItemDelegate {
 
             Label {
                 text: model.state
-                color: _closed ? constants.mutedForeground : Material.foreground
+                color: _closed
+                        ? constants.mutedForeground
+                        : model.state == 'OPEN'
+                            ? constants.colorChannelOpen
+                            : Material.foreground
             }
         }