[#13365] Add validation for email input in feedback form #13387
+711
−308
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Fixes #13365
Implemented client-side validation for email-type questions in feedback sessions.
Now, when a question in a feedback session expects an email address, the input field validates the format before submission. Users will only be able to submit the form if the entered value is a valid email.
Additionally:
Added corresponding error message styling: invalid email inputs are highlighted in red.
Updated relevant CSS classes to ensure error state is clear and consistent with the existing UI styling.
Tested to confirm correct behavior:
Valid email format → form submits normally.
Screenshots are included below to demonstrate the UI changes

Before:
After:

