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

node_modules/@gkucmierz/utils/spec/square-root.spec.mjs

@@ -0,0 +1,22 @@
+
+import {
+  squareRoot,
+  squareRootBI,
+} from '../src/square-root.mjs';
+
+describe('square-root', () => {
+  it('squareRootBI small', () => {
+    expect(squareRootBI(0n)).toEqual(0n);
+    expect(squareRootBI(1n)).toEqual(1n);
+    expect(squareRootBI(2n)).toEqual(1n);
+    expect(squareRootBI(3n)).toEqual(1n);
+    expect(squareRootBI(4n)).toEqual(2n);
+  });
+
+  it('squareRootBI 0-1e3', () => {
+    for (let i = 0; i < 1e3; ++i) {
+      const sqf = BigInt(Math.floor(i ** 0.5));
+      expect(squareRootBI(BigInt(i))).toEqual(sqf);
+    }
+  });
+});