Refactor: Implement SmartCube renderer, improve UI styling, and fix gaps

test/test_rubiks_import.js

@@ -0,0 +1,12 @@
+
+import { State } from 'rubiks-js/src/state/index.js';
+
+console.log('State imported successfully');
+const state = new State(true);
+console.log('State instantiated');
+
+state.applyTurn('R');
+console.log('Applied turn R');
+
+const encoded = state.encode();
+console.log('Encoded state:', encoded);