As a user, I want end date for news event to automaticly be after start date, so that I can just change the time for end date, without having to chagne date too

### 📝 Description

# Improve Start/End Date Handling

## Current Behavior
- `startDate` and `endDate` are initialized to the current date and time.
- Users currently have to manually update:
1. Start date
2. Start time
3. End date
4. End time

## Proposed Improvement
- When the user updates the **start date**:
- If the current **end date** is before the new start date, automatically set the end date to match the start date.
- Users would then only need to adjust the **end time**, reducing unnecessary steps.

## Benefit
- Simplifies the workflow.
- Reduces potential errors from accidentally setting an end date earlier than the start date.

### ✅ Acceptance Criteria

- [ ] When user changes start date for event, end date becomes same as start date
- [ ] The above only happens if end date becomes prior to start date

### 💡 Additional context

_No response_