Sayali: resolve duplicate badge assignment and fix checkbox display for existing badges in dark mode

[sayali-2308]

Description

Fixes #3237 (Priority Medium)

Main changes explained:

• Fixed returnUpdatedBadgesCollectionSingleUser in badgeManagement.js to use immutable approach preventing duplicate entries on all existing badges when a new badge is assigned
• Fixed broken e.target hyperlink in AssignTableRow.jsx
• Fixed propExistBadges prop name mismatch in UserProfile/AssignBadgePopup.jsx
• Fixed isSelected logic so existing badges show as checked when modal opens
• Prevented existing badges from being re-assigned accidentally
• Fixed dark mode dropdown date text color in BadgeReport.jsx

How to test:

1. Check out branch
2. npm install and npm run start:local
3. Clear cache, log in as admin
4. Navigate to any User Profile
5. Click "Assign Badges" — verify existing badges show as checked
6. Select a new badge and click Confirm
7. Click "Select Featured" — verify existing badges did NOT get duplicated
8. Verify newly assigned badge appears with count 1
9. Verify dark mode works correctly including dates dropdown

Screenshots:

Note:

This PR finishes the work started in PR #3237 from scratch with a cleaner fix.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[HemanthNidamanuru]

Hi Sayali,

I tested this PR lPR locally but was unable to assign badges as the page keeps showing repeated "It was not possible to retrieve the team codes" error toasts on load when clicked on the profile of a user. Please fix this.

[sayali-2308]

Hi @HemanthNidamanuru , I tested locally and the badge assignment is working correctly on my end with no team codes errors. The 'retrieve team codes' toast is unrelated to this PR it comes from fetchTeamCodeAllUsers calling the WEEKLY_SUMMARIES_TEAM_CODES backend endpoint. Please ensure your backend is running on port 4500 with npm run build then npm start and try again.