feat: Add CalendarSelector component and install new dependencies.

node_modules/concurrently/dist/bin/read-package.d.ts

@@ -0,0 +1,6 @@
+/**
+ * Traverses the directory tree until a package.json file is found.
+ *
+ * @throws if the root directory is reached, and no package.json is found.
+ */
+export declare function readPackage(): Record<string, unknown>;