Vamsidhar - fix: calendar dark mode and issue chart visibility

[vamsidharpanithi]

Description

Fixes calendar dark mode issue where the calendar component was always in dark mode regardless of the webpage's light/dark mode setting. Also fixes issue chart visibility where certain issues were not shown when multiple projects were selected, and implements consistent per-project issue numbering to avoid conflicts.

Related PRs (if any):

Previous PR #4301
BackendPR #1982
To test this frontend PR, you need to checkout the corresponding backend PR branch and ensure the backend is running with the updated code.

Main changes explained:

How to test:

1. check into current branch
2. do npm install and ... to run this PR locally
3. Clear site data/cache
4. log as admin user
5. go to dashboard→ Reports -> Total Construction Summary -> Issue Tracking
6. verify the date filter and project filter work properly
7. verify there is no text overlap, and all data is visible
8. verify this new feature works in dark mode

Screenshots or videos of changes:

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
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