DBC22-6874: fix Bulletin header unread count pill

[ray-oxd]

📝 Submitter

🔗 JIRA Ticket

• Ticket Link: DBC22-6874

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✅ Quality Assurance & Requirements

• Requirements Met: I have confirmed that all acceptance criteria from the JIRA ticket are fulfilled.
• Tested desktop in local or dev envs
• Tested mobile in local or dev envs
• Ran unit tests locally
• SonarCloud: I have verified that the SonarCloud analysis is clean/passing for this branch.

⚙️ Configuration & Environment

• New Env Variables: No

🧪 How to Test (if required)

1. Open DriveBC and note the Bulletins nav item (header unread pill may be missing before this fix).
2. In CMS, create or edit a Bulletin and click Publish with notifications.
3. Confirm the Bulletins header item shows an update pill with the correct unread count (e.g. 1).
4. Repeat with an Advisory and confirm Advisories header pill still works.
5. Optional: if other bulletins have never been published with notifications (last_notified_at null), confirm they do not suppress the count for notified ones.

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🔍 Reviewer Checklist

• Reviewed code for logic and cleanliness
• Re-tested desktop/mobile in local or dev envs
• Verified no new console warnings/errors
• Confirmed that any new env variables are understood/documented