User Onboarding + Bug Fixes (#1352)

* Bump min supported date to 20 years

* Add basic onboarding

* User onboarding

* Complete onboarding flow

* Cleanup, add user profile update test

app/javascript/controllers/onboarding_controller.js

@@ -0,0 +1,29 @@
+import { Controller } from "@hotwired/stimulus";
+
+// Connects to data-controller="onboarding"
+export default class extends Controller {
+  setLocale(event) {
+    this.refreshWithParam("locale", event.target.value);
+  }
+
+  setDateFormat(event) {
+    this.refreshWithParam("date_format", event.target.value);
+  }
+
+  setCurrency(event) {
+    this.refreshWithParam("currency", event.target.value);
+  }
+
+  refreshWithParam(key, value) {
+    const url = new URL(window.location);
+    url.searchParams.set(key, value);
+
+    // Preserve existing params by getting the current search string
+    // and appending our new param to it
+    const currentParams = new URLSearchParams(window.location.search);
+    currentParams.set(key, value);
+
+    // Refresh the page with all params
+    window.location.search = currentParams.toString();
+  }
+}