refactor(styles/widgets): update CSS color variables to use glass theming

src/styles/widgets/dropdown.css

@@ -6,9 +6,8 @@
 }
 
 #dropdown-options {
-  background-color: @bg-a50;
-  box-shadow: inset 0 0 0 1px alpha(@fg-a40, 0.4);
-  border: 1px solid @outline-a40;
+  background-color: @glass-menu;
+  border: 1px solid @glass-border;
   border-radius: 0.75rem;
   padding: 0.5rem;
 }
@@ -24,7 +23,7 @@
 #dropdown-option:hover {
   color: @on-primary;
   transition: all 20ms ease-in-out;
-  background-color: @primary;
+  background-color: @glass-accent;
 }
 
 #dropdown-option:hover #dropdown-option-label {
@@ -48,7 +47,7 @@
 
 #dropdown-option-keybind {
   font-weight: 500;
-  color: @fg-a80;
+  color: @glass-text-secondary;
 }
 
 /* Divider */
@@ -60,6 +59,6 @@
   margin: 2px;
 }
 #dropdown-divider {
-  border-bottom: 1px solid alpha(@fg-a80, 0.3);
+  border-bottom: 1px solid @glass-divider;
   margin: 2px 0;
 }