feat(picker): use gray tokens

Author: thetaPC

core/src/components/picker/picker.ios.scss

@@ -18,5 +18,5 @@
 }
 
 :host .picker-highlight {
-  background: var(--highlight-background, var(--ion-color-step-150, var(--ion-background-color-step-150, #eeeeef)));
+  background: var(--highlight-background, var(--ion-components-ion-picker-highlight-bg));
 }

core/src/themes/ios/dark.tokens.ts

@@ -88,5 +88,8 @@ export const darkTheme: DarkTheme = {
       indicatorBgFocused: colors.gray['150']!,
       separatorColor: colors.gray['550']!,
     },
+    IonPicker: {
+      highlightBg: colors.gray['150']!, // Available only in iOS
+    },
   },
 };

core/src/themes/ios/light.tokens.ts

@@ -30,5 +30,8 @@ export const lightTheme: LightTheme = {
     IonModal: {
       handleBg: '#c0c0be',
     },
+    IonPicker: {
+      highlightBg: '#eeeeef', // Available only in iOS
+    },
   },
 };