Made Notification badge count dynamic

[Lemeri123]

Description of change

This pull request addresses the issue where the notification badge was displaying a fixed value of 1. The badge now dynamically shows the total number of announcements. Additionally, when a user views an announcement, the notification count decreases.
Screencast from 2025-08-11 19-01-48.webm

closes #96

Checklist

• npm test and npm run build passes
• documentation is changed or added (if applicable)
• permission has been obtained to add new logo (if applicable)
• contribution guidelines followed here

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[gdams]

Thank for raising this, my only concern here is that if you refresh the page the count returns to the original number. My thoughts are, keep this logic in place but only show notifications if they're from the last week. What do you think?

[codecov]

Codecov Report

❌ Patch coverage is 15.51724% with 49 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.79%. Comparing base (b3cb00d) to head (af7f35f).
⚠️ Report is 41 commits behind head on main.

Files with missing lines	Patch %	Lines
src/components/NavBar/index.tsx	0.00%	45 Missing ⚠️
src/components/Announcements/TabContent.tsx	66.66%	2 Missing ⚠️
src/components/Announcements/index.tsx	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
- Coverage   70.98%   70.79%   -0.20%     
==========================================
  Files         200      200              
  Lines       14029    14071      +42     
  Branches     1069     1069              
==========================================
+ Hits         9959     9961       +2     
- Misses       4053     4093      +40     
  Partials       17       17              

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[Lemeri123]

Thank for raising this, my only concern here is that if you refresh the page the count returns to the original number. My thoughts are, keep this logic in place but only show notifications if they're from the last week. What do you think?

Ohhhh okay thats a good idea. Let me adjust to that

[Lemeri123]

@gdams