## Description
Handle messages with null content properly in UI and email notifications
## Type of change
- [ ] Bug fix (non-breaking change which fixes an issue)
## Relevant Screenshots:
<img width="688" height="765" alt="Screenshot 2026-01-21 at 4 43 00 PM"
src="https://github.com/user-attachments/assets/6a27c22e-2ae6-4377-a05d-cfa44bf181fe"
/>
## Checklist:
- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> **Medium Risk**
> Touches notification email templates and message rendering conditions;
mistakes could lead to missing content/attachments in emails or
incorrect UI visibility, but changes are localized and non-auth/security
related.
>
> **Overview**
> Agent notification emails for *assigned* and *participating* new
messages now include the actual message details (sender name, rendered
text when present, and attachment links) and gracefully fall back when
content is unavailable.
>
> To support this, the mailer now passes `@message` into Liquid via
`MessageDrop` (adding `attachments` URLs), and the dashboard message UI
now renders failed/external-error messages even when `content` is `null`
while tightening retry eligibility to require content or attachments
(and still within 1 day).
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
475c8cedda54eb5e806990f977faf8098d0b27d8. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
---------
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Fixes [CW-5540](https://linear.app/chatwoot/issue/CW-5540/feat-allow-retry-a-failed-message-sendout),
https://github.com/chatwoot/chatwoot/issues/12333
## Type of change
- [x] New feature (non-breaking change which adds functionality)
## How Has This Been Tested?
### Screenshot
<img width="196" height="113" alt="image"
src="https://github.com/user-attachments/assets/8b4a1aa9-c75c-4169-b4a2-e89148647e91"
/>
## 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
- [x] 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 Keloth <muhsinkeramam@gmail.com>
This PR adds missing error handlers for the following channels and cases
1. WhatsApp - Generic Handlers for both Cloud and 360Dialog (Deprecated)
2. Instagram - Handler for a case where there is an HTTP error instead
of an `:error` in the 200 response
3. Facebook - Errors from the two sentry issues
([Net::OpenTimeout](https://chatwoot-p3.sentry.io/issues/6164805227) &
[JSON::ParserError](https://chatwoot-p3.sentry.io/issues/5903200786))
4. SMS: Generic handlers for Bandwidth SMS
#### Checklist
- [x] Bandwidth SMS
- [x] Whatsapp Cloud + 360 Dialog
- [x] Twilio SMS
- [x] Line
- [x] Telegram
- [x] Instagram
- [x] Facebook
- [x] GMail
- [x] 365 Mail
- [x] SMTP Mail
---------
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
