Describe every setting under its name

Properties can carry a one-line description, set with
NamedProperty.description for mods, a ConfigManager.property overload for
the client's config, and a helper in ModLayout. PropertyList rows show it
under the setting's name in muted text. Every mod, HUD layout, general,
UI style and animation setting now has one.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/main/java/org/saturnclient/config/ConfigManager.java

@@ -70,6 +70,14 @@ public class ConfigManager {
         return value;
     }
 
+    /**
+     * Add a property with the line shown under its name
+     */
+    public Property property(String name, Property value, String description) {
+        value.description = description;
+        return property(name, value);
+    }
+
     /**
      * Add empty namespace
      */