WIP: feat(ui): Migrate to new UI implementation

lib/core/moonwell_theme_variant.dart

@@ -0,0 +1,11 @@
+enum MoonWellThemeVariant {
+  forest,
+  temple;
+
+  static MoonWellThemeVariant fromStoredValue(String? value) {
+    return MoonWellThemeVariant.values.firstWhere(
+      (variant) => variant.name == value,
+      orElse: () => MoonWellThemeVariant.forest,
+    );
+  }
+}