Sayali add bulk actions for managers

[sayali-2308]

Description

Implements #19 (Priority Medium)

Related PRS (if any):

Based on existing work from PR #3857 and PR #4290 (frontend only, no backend PR needed)
…

Main changes explained:

• Updated TeamCard.jsx to add bulk action bar, checkbox state management, Redux darkMode integration and confirmation modal
• Updated TeamMemberRow.jsx to add checkbox input and selected state styling
• Updated TeamCard.module.css to add styles for bulk action bar, checkbox, selected row highlight and confirmation modal
  …

How to test:

1. Check out branch Sayali_Add_Bulk_Actions_For_Managers
2. Do npm install and npm run start:local to run this PR locally
3. Clear site data/cache
4. Log as admin user
5. Navigate to http://localhost:5173/hgnteam
6. Verify checkboxes appear on each member row
7. Verify Send Message and Request Skill Update buttons are disabled when no members selected
8. Select one or more members and verify buttons become active (blue)
9. Click Send Message → verify confirmation modal appears with correct member count → click Yes, Proceed → verify success toast and selection clears
10. Click Request Skill Update → same verification as above
11. Click Cancel on modal → verify selection stays intact
12. Verify this new feature works in [dark mode]

Screenshots or videos of changes:

Note:

APIs are not wired yet as per existing notes from PR #3857 and #4290.
Toast messages are UI placeholders until backend is ready.

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[sonarqubecloud]

Quality Gate passed

Issues
4 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