Add UI click sounds (#22410)

* Add UI click sounds

* tweaks

* Significant cleanup

* Audio options and numerous fixes

* Fix the remaining UI elements

* new click sound

---------

Co-authored-by: Kara <lunarautomaton6@gmail.com>

Content.Shared/CCVar/CCVars.cs

@@ -81,6 +81,12 @@ namespace Content.Shared.CCVar
         public static readonly CVarDef<float> LobbyMusicVolume =
             CVarDef.Create("ambience.lobby_music_volume", 0.50f, CVar.ARCHIVE | CVar.CLIENTONLY);
 
+        /// <summary>
+        /// UI volume.
+        /// </summary>
+        public static readonly CVarDef<float> InterfaceVolume =
+            CVarDef.Create("audio.interface_volume", 0.50f, CVar.ARCHIVE | CVar.CLIENTONLY);
+
         /*
          * Status
          */
@@ -573,6 +579,16 @@ namespace Content.Shared.CCVar
         public static readonly CVarDef<bool> DatabaseSynchronous =
             CVarDef.Create("database.sync", false, CVar.SERVERONLY);
 
+        /*
+         * Interface
+         */
+
+        public static readonly CVarDef<string> UIClickSound =
+            CVarDef.Create("interface.click_sound", "/Audio/UserInterface/click.ogg", CVar.REPLICATED);
+
+        public static readonly CVarDef<string> UIHoverSound =
+            CVarDef.Create("interface.hover_sound", "/Audio/UserInterface/hover.ogg", CVar.REPLICATED);
+
         /*
          * Outline
          */