feat: Add CalendarSelector component and install new dependencies.

node_modules/concurrently/index.mjs

@@ -0,0 +1,9 @@
+/*
+ * While in local development, make sure you've run `pnpm run build` first.
+ */
+
+import { concurrently } from './dist/src/index.js';
+
+export * from './dist/src/index.js';
+
+export default concurrently;