Datepicker crashes when value is invalid and calendar is clicked

[offtherailz]

Description

Screencast.from.2025-09-25.14-15-46.webm

How to reproduce

• Add to the map a layer with date-time value
• Open feature grid for the record
• start editing
• Create a new row with "Add record" button
• select the date cell for the new value
• type "2" on the keyboard
• Click on calendar

Expected Result

• Calendar shows
  Current Result

• Calendar crashes

• Not browser related

Browser info

(use this site: https://www.whatsmybrowser.org/ for non expert users)

Browser Affected	Version
Internet Explorer
Edge
Chrome
Firefox
Safari

Other useful information

[offtherailz]

tested on dev. It works properly. Backporting