Rename the Color singleton to avoid the Qt 6.12 clash

shell/plugins/image-picker/ImagePicker.qml

@@ -30,14 +30,14 @@ Item {
   property string doneFile: ""
   property string filterText: ""
   property var doneFilesToRelease: []
-  // Bound to the central [image-picker] section in shell.toml via Color.qml.
+  // Bound to the central [image-picker] section in shell.toml via Colors.qml.
   // `dimColor` tints unselected slices and text outlines on top of the scrim;
   // it intentionally tracks the foundational background, not a surface role.
-  property color dimColor: Color.background
-  property color foreground: Color.imagePicker.text
-  property color scrim: Color.imagePicker.scrim
-  property color selectedBorder: Color.imagePicker.selectedBorder
-  property color unselectedBorder: Color.imagePicker.unselectedBorder
+  property color dimColor: Colors.background
+  property color foreground: Colors.imagePicker.text
+  property color scrim: Colors.imagePicker.scrim
+  property color selectedBorder: Colors.imagePicker.selectedBorder
+  property color unselectedBorder: Colors.imagePicker.unselectedBorder
   property int expandedWidth: 768
   property int expandedHeight: 475
   property int sliceWidth: 108