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

node_modules/@gkucmierz/utils/spec/matrix.spec.mjs

@@ -0,0 +1,19 @@
+
+import {
+  matrixAsArray,
+} from '../src/matrix.mjs';
+
+describe('matrix', () => {
+  it('matrixAsArray', () => {
+    const m = [
+      [1, 2],
+      [3, 4],
+    ];
+    const arr = matrixAsArray(m);
+    expect(arr.length).toBe(4);
+    expect(arr[0]).toBe(1);
+    expect(arr[1]).toBe(2);
+    expect(arr[2]).toBe(3);
+    expect(arr[3]).toBe(4);
+  });
+});