🐛 fix(analytics): prevent multiple GTM initializations

Summary

This PR addresses the issue of multiple unnecessary initializations of Google Tag Manager (GTM) in the LibreChat application. Currently, TagManager.initialize is being called redundantly, resulting in GTM being added every time the Chat screen is opened. This PR implements a check to ensure GTM is initialized only once per session, improving performance and preventing potential analytics data inconsistencies.

Closes https://github.com/danny-avila/LibreChat/issues/4171

Change Type

[x] Bug fix (non-breaking change which fixes an issue)

Testing

To test this change:

Clone the updated branch
Run the application locally
Open the Chat screen multiple times
Use browser developer tools to verify that GTM is initialized only once

Checklist

[x] My code adheres to this project's style guidelines
[x] I have performed a self-review of my own code
[x] I have commented in any complex areas of my code
[x] My changes do not introduce new warnings
[x] I have written tests demonstrating that my changes are effective or that my feature works
[x] Local unit tests pass with my changes

Changes

This PR modifies two files:

client/src/components/Chat/Footer.tsx
client/src/hooks/Config/useAppStartup.ts

In both files, the GTM initialization logic has been updated to check for the existence of window.google_tag_manager before calling TagManager.initialize.

Footer.tsx

useEffect(() => {
  if (config?.analyticsGtmId != null && typeof window.google_tag_manager === 'undefined') {
    const tagManagerArgs = {
      gtmId: config.analyticsGtmId,
    };
    TagManager.initialize(tagManagerArgs);
  }
}, [config?.analyticsGtmId]);

useAppStartup.ts

useEffect(() => {
  if (config?.analyticsGtmId != null && typeof window.google_tag_manager === 'undefined') {
    const tagManagerArgs = {
      gtmId: config.analyticsGtmId,
    };
    TagManager.initialize(tagManagerArgs);
  }
}, [config?.analyticsGtmId]);

These changes ensure that GTM is initialized only if it hasn't been already, preventing multiple unnecessary initializations.

danny-avila / LibreChat