feat: Changelog card components (#12673)

# Pull Request Template

## Description

This PR introduces a new changelog component that can be used in the
sidebar.

Fixes
https://linear.app/chatwoot/issue/CW-5776/changelog-card-ui-component

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

### Screencast



https://github.com/user-attachments/assets/42e77e82-388a-4fc9-9b37-f3d0ea1a9d7f







## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Muhsin <muhsinkeramam@gmail.com>

app/javascript/shared/constants/links.js

@@ -6,3 +6,5 @@ export const REPLY_POLICY = {
   WHATSAPP_CLOUD:
     'https://business.whatsapp.com/policy#:~:text=You%20may%20reply%20to%20a,messages%20via%20approved%20Message%20Templates.',
 };
+
+export const CHANGELOG_API_URL = 'https://hub.2.chatwoot.com/changelogs';