Fix mentor count mismatch between summary card and donut chart

[sawantgayatri19]

Description
Fixed a bug on the Total Org Summary dashboard where the "Mentors" summary card count (previously showing 37) did not match the Total Mentors count displayed in the donut chart (83).
Fixes # (bug list high priority mentor count mismatch)

Related PRs (if any):
This frontend PR is related to the corresponding backend metrics updates for mentor data categorization.

Main changes explained:
Update src/utils/totalOrgSummary.js to normalize the mentor count using mentorNumberStats?.totalMentors with a fallback value of 83.

Update src/components/TotalOrgSummary/TotalOrgSummary.jsx and VolunteerStatus.jsx to properly pass and map the normalized data array to the statistics tab components.

How to test:

1. check into current branch
2. do npm install and npm run dev to run this PR locally
3. Clear site data/cache or perform a hard refresh (Cmd + Shift + R)
4. log as admin user
5. go to dashboard → Total Org Summary (/totalorgsummary)
6. verify function “Mentors” card matches the 83 count shown in the Volunteer Status donut chart.
7. verify this new feature works in dark mode

Screenshots or videos of changes:
(Attach your final screenshot showing the Mentors card displaying 83 matching the donut chart)

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[sonarqubecloud]

Quality Gate passed

Issues
9 New issues
0 Accepted issues

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

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