style: replace solid accent hover/active with glass effect

- glass-hover: alpha(@foreground,0.08) → alpha(white,0.10)
- glass-active: alpha(@foreground,0.14) → alpha(white,0.50)
- panel, settings, dropdown, tray, notification hover → glass-hover
- battery, wifi, bluetooth connected icons → glass-active
- wifi-icon-box base dimmed to glass-hover for contrast

src/styles/widgets/dropdown.css

@@ -21,13 +21,13 @@
 }
 
 #dropdown-option:hover {
-  color: @on-primary;
+  color: @glass-text;
   transition: all 20ms ease-in-out;
-  background-color: @glass-accent;
+  background-color: @glass-hover;
 }
 
 #dropdown-option:hover #dropdown-option-label {
-  color: @on-primary;
+  color: @glass-text;
 }
 
 #dropdown-option-label {
@@ -42,7 +42,7 @@
 }
 
 #dropdown-option:hover #dropdown-option-keybind {
-  color: @on-primary;
+  color: @glass-text;
 }
 
 #dropdown-option-keybind {