Added distro logo (for SidePanel widget)

BarTab: add toggle for distro logo replacement
DistroLogoService: handle all logo detection logic
SidePanelToggle: add support for distro logo
WidgetLoader: fix small issue with with screen null warning

Modules/Bar/Widgets/SidePanelToggle.qml

@@ -1,4 +1,6 @@
 import Quickshell
+import Quickshell.Widgets
+import QtQuick.Effects
 import qs.Commons
 import qs.Widgets
 import qs.Services
@@ -9,7 +11,7 @@ NIconButton {
   property ShellScreen screen
   property real scaling: 1.0
 
-  icon: "widgets"
+  icon: Settings.data.bar.useDistroLogo ? "" : "widgets"
   tooltipText: "Open side panel"
   sizeRatio: 0.8
 
@@ -20,4 +22,25 @@ NIconButton {
 
   anchors.verticalCenter: parent.verticalCenter
   onClicked: PanelService.getPanel("sidePanel")?.toggle(screen)
+
+  // When enabled, draw the distro logo instead of the icon glyph
+  IconImage {
+    id: logo
+    anchors.centerIn: parent
+    width: root.width * 0.6
+    height: width
+    source: Settings.data.bar.useDistroLogo ? DistroLogoService.osLogo : ""
+    visible: false //Settings.data.bar.useDistroLogo && source !== ""
+    smooth: true
+  }
+
+  MultiEffect {
+    anchors.fill: logo
+    source: logo
+    //visible: logo.visible
+    colorization: 1
+    brightness: 1
+    saturation: 1
+    colorizationColor: root.hovering ? Color.mSurfaceVariant : Color.mOnSurface
+  }
 }