update themes & images, fix SelectableElement CSS

source/Ox.UI/css/theme.css

@@ -1101,11 +1101,13 @@ Miscellaneous
     background-image: -webkit-linear-gradient(top, $listItemGradient);
 }
 .$themeClass .OxSelectableElement.OxSelected {
+    color: $listItemSelectedColor;
     background-image: -moz-linear-gradient(top, $listItemSelectedGradient);
     background-image: -o-linear-gradient(top, $listItemSelectedGradient);
     background-image: -webkit-linear-gradient(top, $listItemSelectedGradient);
 }
 .$themeClass .OxSelectableElement.OxSelected.OxFocus {
+    color: $listItemFocusSelectedColor;
     background-image: -moz-linear-gradient(top, $listItemFocusSelectedGradient);
     background-image: -o-linear-gradient(top, $listItemFocusSelectedGradient);
     background-image: -webkit-linear-gradient(top, $listItemFocusSelectedGradient);

source/Ox.UI/themes/oxmedium/json/theme.jsonc

@@ -57,7 +57,7 @@
 
     "dialogBackground": [160, 160, 160, 0.95],
     "dialogShadow": [0, 0, 0, 0.75],
-    "dialogBarGradient": [[160, 160, 160, 0.95], [128, 128, 128, 0.95]],
+    "dialogBarGradient": [[176, 176, 176, 0.95], [144, 144, 144, 0.95]],
     "dialogLayerBackground": [0, 0, 0],
     "dialogReflectionGradient": [[160, 160, 160, 0.75], [160, 160, 160, 1]],