feat: Update the design for dashboard_apps (#9840)

This PR migrates the dashboard apps page to the new layout and includes
the following updates:

- Create a compact design for the back button
- Add a back button to the settings header
- Reduce letter-spacing on the description
- Fix mobile styles
- Migrate the layout of dashboard apps/index to new layouts


Note: I've moved all feature help URLs from features.yml to the frontend. This change prevents features.yml from becoming bloated due to frontend modifications.

---------

Co-authored-by: Sojan Jose <sojan@pepalo.com>

app/javascript/dashboard/helper/featureHelper.js

@@ -1,4 +1,20 @@
+const FEATURE_HELP_URLS = {
+  channel_email: 'https://chwt.app/hc/email',
+  channel_facebook: 'https://chwt.app/hc/fb',
+  help_center: 'https://chwt.app/hc/help-center',
+  agent_bots: 'https://chwt.app/hc/agent-bots',
+  team_management: 'https://chwt.app/hc/teams',
+  labels: 'https://chwt.app/hc/labels',
+  custom_attributes: 'https://chwt.app/hc/custom-attributes',
+  canned_responses: 'https://chwt.app/hc/canned',
+  integrations: 'https://chwt.app/hc/integrations',
+  campaigns: 'https://chwt.app/hc/campaigns',
+  reports: 'https://chwt.app/hc/reports',
+  message_reply_to: 'https://chwt.app/hc/reply-to',
+  sla: 'https://chwt.app/hc/sla',
+  dashboard_apps: 'https://chwt.app/hc/dashboard-apps',
+};
+
 export function getHelpUrlForFeature(featureName) {
-  const { helpUrls } = window.chatwootConfig;
-  return helpUrls[featureName];
+  return FEATURE_HELP_URLS[featureName];
 }