feat: Support dark mode in login pages (#7420)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

app/javascript/packs/v3app.js

@@ -0,0 +1,61 @@
+import Vue from 'vue';
+import VueI18n from 'vue-i18n';
+import VueRouter from 'vue-router';
+import Vuelidate from 'vuelidate';
+import i18n from 'dashboard/i18n';
+import * as Sentry from '@sentry/vue';
+import { Integrations } from '@sentry/tracing';
+import {
+  initializeAnalyticsEvents,
+  initializeChatwootEvents,
+} from 'dashboard/helper/scriptHelpers';
+import AnalyticsPlugin from 'dashboard/helper/AnalyticsHelper/plugin';
+import App from '../v3/App.vue';
+import router, { initalizeRouter } from '../v3/views/index';
+import store from '../v3/store';
+import FluentIcon from 'shared/components/FluentIcon/DashboardIcon';
+
+Vue.config.env = process.env;
+
+if (window.errorLoggingConfig) {
+  Sentry.init({
+    Vue,
+    dsn: window.errorLoggingConfig,
+    denyUrls: [
+      // Chrome extensions
+      /^chrome:\/\//i,
+      /chrome-extension:/i,
+      /extensions\//i,
+
+      // Locally saved copies
+      /file:\/\//i,
+
+      // Safari extensions.
+      /safari-web-extension:/i,
+      /safari-extension:/i,
+    ],
+    integrations: [new Integrations.BrowserTracing()],
+  });
+}
+
+Vue.use(VueRouter);
+Vue.use(VueI18n);
+Vue.use(Vuelidate);
+Vue.use(AnalyticsPlugin);
+Vue.component('fluent-icon', FluentIcon);
+
+const i18nConfig = new VueI18n({ locale: 'en', messages: i18n });
+
+window.bus = new Vue();
+initializeChatwootEvents();
+initializeAnalyticsEvents();
+initalizeRouter();
+window.onload = () => {
+  new Vue({
+    router,
+    store,
+    i18n: i18nConfig,
+    components: { App },
+    template: '<App/>',
+  }).$mount('#app');
+};