Akshith: fix event date selector

[akshith312]

Description

Related PRS (if any):

This frontend PR is not related to any other PR.
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Main changes explained:

• Disabled Date selector from displaying past dates.
• Added Error message if past date is entered for the event date.
  …

How to test:

1. check into current branch
2. do npm install and npm run start:local to run this PR locally
3. Clear site data/cache
4. login as admin user
5. go to dashboard→ https://localhost:5173/communityportal/reports/participation
6. Click on Event Date.
7. The Date selector now displays the present dates and future.
8. Try typing a past date for the event date and creating the event.
9. The modal displays error message indicating past date is not allowed.

Screenshots or videos of changes:

Screen.Recording.2026-02-24.213624.mp4

Note:

Include the information the reviewers need to know.

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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

[Vishnu10-hub]

I tested the PR locally. Backend running on port 4500 and frontend on 5173. Navigated to /communityportal/reports/participation. when I manually typed a past date and created the event, the system still allowed the event to be created and no validation error message was shown. According to the testing steps, the modal should display an error indicating past dates are not allowed. So the validation is not working as expected. Requesting changes.