Always visible arrows, new remote config

stylesheets/components/SafetyNumberViewer.scss

@@ -114,13 +114,6 @@
 
       width: 18px;
       height: var(--height);
-
-      opacity: 0;
-      transition: opacity 200ms ease-in-out;
-
-      &:hover {
-        opacity: 1;
-      }
     }
 
     &__prev {

ts/RemoteConfig.ts

@@ -31,6 +31,7 @@ export type ConfigKeyType =
   | 'desktop.pnp'
   | 'desktop.retryRespondMaxAge'
   | 'desktop.safetyNumberAci'
+  | 'desktop.safetyNumberAci.beta'
   | 'desktop.senderKey.retry'
   | 'desktop.senderKey.send'
   | 'desktop.senderKeyMaxAge'

ts/state/selectors/items.ts

@@ -166,7 +166,15 @@ export const getSafetyNumberMode = createSelector(
     serverTimeSkew: number,
     now: number
   ): SafetyNumberMode => {
-    if (!isRemoteConfigFlagEnabled(remoteConfig, 'desktop.safetyNumberAci')) {
+    if (
+      !isRemoteConfigFlagEnabled(remoteConfig, 'desktop.safetyNumberAci') &&
+      !(
+        isRemoteConfigFlagEnabled(
+          remoteConfig,
+          'desktop.safetyNumberAci.beta'
+        ) && isBeta(window.getVersion())
+      )
+    ) {
       return SafetyNumberMode.E164;
     }