feat(app): add initial widgets

src/components/Widgets/Calculation.tsx

@@ -0,0 +1,54 @@
+'use client';
+
+import { Calculator, Equal } from 'lucide-react';
+
+type CalculationWidgetProps = {
+  expression: string;
+  result: number;
+};
+
+const Calculation = ({ expression, result }: CalculationWidgetProps) => {
+  return (
+    <div className="rounded-lg bg-light-secondary dark:bg-dark-secondary border border-light-200 dark:border-dark-200 overflow-hidden shadow-sm">
+      <div className="flex items-center gap-2 p-3 bg-light-100/50 dark:bg-dark-100/50 border-b border-light-200 dark:border-dark-200">
+        <div className="rounded-full p-1.5 bg-light-100 dark:bg-dark-100">
+          <Calculator className="w-4 h-4 text-black/70 dark:text-white/70" />
+        </div>
+        <span className="text-sm font-medium text-black dark:text-white">
+          Calculation
+        </span>
+      </div>
+
+      <div className="p-4 space-y-3">
+        <div>
+          <div className="flex items-center gap-1.5 mb-1.5">
+            <span className="text-xs text-black/50 dark:text-white/50 font-medium">
+              Expression
+            </span>
+          </div>
+          <div className="bg-light-100 dark:bg-dark-100 rounded-md p-2.5 border border-light-200 dark:border-dark-200">
+            <code className="text-sm text-black dark:text-white font-mono break-all">
+              {expression}
+            </code>
+          </div>
+        </div>
+
+        <div>
+          <div className="flex items-center gap-1.5 mb-1.5">
+            <Equal className="w-3.5 h-3.5 text-black/50 dark:text-white/50" />
+            <span className="text-xs text-black/50 dark:text-white/50 font-medium">
+              Result
+            </span>
+          </div>
+          <div className="bg-gradient-to-br from-light-100 to-light-secondary dark:from-dark-100 dark:to-dark-secondary rounded-md p-4 border-2 border-light-200 dark:border-dark-200">
+            <div className="text-4xl font-bold text-black dark:text-white font-mono tabular-nums">
+              {result.toLocaleString()}
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default Calculation;