Add birth date gating to moderation settings (#1435)

* Add birth date preference, modal to set, link in settings, and age gate in moderation

* Styling fixes for android

* Fix types

src/view/shell/desktop/LeftNav.tsx

@@ -311,7 +311,7 @@ export const DesktopLeftNav = observer(function DesktopLeftNav() {
         icon={
           <HandIcon
             strokeWidth={5.5}
-            style={pal.text as FontAwesomeIconStyle}
+            style={pal.text}
             size={isDesktop ? 24 : 27}
           />
         }