feat(app): add initial widgets

src/lib/agents/search/widgets/index.ts

@@ -1,6 +1,10 @@
+import calculationWidget from './calculationWidget';
 import WidgetRegistry from './registry';
 import weatherWidget from './weatherWidget';
+import stockWidget from './stockWidget';
 
 WidgetRegistry.register(weatherWidget);
+WidgetRegistry.register(calculationWidget);
+WidgetRegistry.register(stockWidget);
 
 export { WidgetRegistry };