fix: deactivated volunteers count respects time filter

[roshini1212]

Description

Deactivated Volunteers in Total Org Summary showed historical total instead of respecting selected time filter.

Fixes # (bug list priority HIGH Yagna: Deactivated Volunteers Count Not getting reflected with Time Filter)

Related PRs (if any):

Backend-only PR. No frontend changes needed.

Main changes explained:

• Update src/helpers/overviewReportHelper.js:
  • OLD: createdDate: { $lte: isoEndDate } (all historical inactives)
  • NEW: lastModifiedDate: { $gte: isoStartDate, $lte: isoEndDate } (only recent deactivations)

How to test:

1. Checkout this branch
2. npm install && npm start (backend restart required)
3. Clear site data/cache
4. Login as Owner → Reports → Total Org Summary
5. Test these ranges:

Date Range	Deactivated Volunteers
2026-02-18 → 2026-02-24	49
2026-02-24 → 2026-02-24	0

Screenshots or videos of changes:

Before fix (same count regardless of dates):

After fix (changes with date range):

Screen.Recording.2026-02-24.at.15.49.15.mov

Note:

• Single aggregation change, no schema changes
• Frontend unchanged - automatically uses corrected backend data
• Tested locally with Owner login

[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