fix: Incorrect date format in Add to mealplan modal

[Saireddy1369]

What type of PR is this?

bug

What this PR does / why we need it:

This PR resolves an issue with the date field hint in the "Add to Plan" dialog box. The hint initially displayed the date format as MM/DD/YYYY, which was inconsistent with the actual date format (YYYY-MM-DD). This inconsistency could confuse users, especially since the field is readonly and uses a date picker.

The hint has now been completely removed to simplify the UI and avoid redundancy.

Changes made:

• Removed the :hint and persistent-hint properties from the <v-text-field> component for the date picker in the "Add to Plan" dialog box.
• Simplified the UI by removing the unnecessary hint, as the field is not intended for manual input.

Which issue(s) this PR fixes:

Fixes #4598

Special notes for your reviewer:

• Please verify that removing the hint does not introduce any regressions in other parts of the application.
• Ensure that the date picker functionality works as expected across different languages and locales.

Testing:

• Tested on the demo site using Firefox 128.4.0esr on Windows 11.
• Verified that the hint has been successfully removed.
• Confirmed that the date picker field remains readonly and continues to function as intended.

[michael-genson]

On mobile, so apologies if this is an obvious question: does the user type the date into this field manually, or do they use a date picker?

If it's a date picker, should we just get rid of the hint? I'm not sure what purpose it serves otherwise

[Saireddy1369]

Yes, it's a date picker. Initially, I thought of avoiding confusion by matching the hint format with the displayed date format, so I made changes to use date-format-hint-yyyy-mm-dd.

However, I completely agree that the hint might be unnecessary since the field isn't meant for manual input. I’ll update my changes to remove the hint altogether to simplify and avoid redundancy. Thank you for pointing it out!

[Saireddy1369]

Updated the code to remove the date picker hint in the 'Add to Plan' dialog. The field uses a date picker, so the hint was unnecessary. Please review the changes. Thanks!

[michael-genson]

Thank you!