DEV - Warn user and block submission when application date is after due date #407

Overview

On the Add Grant and Edit Grant forms, validate that the application date is not after the due date. If it is, show an inline error and disable the submit button until the conflict is resolved.

Tasks

• Write a validation function that compares application date to due date in both Add and Edit Grant cards
• Render an error message below the date fields when validation fails (copy other error messages) when you add conflicting dates in
• Disable the submit button when the error state is active
• Clear the error state when the conflict is resolved

Acceptance Criteria

• If application date > due date, display an inline error near the date fields.
• Submit/save button is disabled while the error condition is active.
• Validation runs on field blur and on submit attempt.
• Error clears immediately when the conflict is resolved.
• Applies to both Add Grant and Edit Grant.
• Test both Add and Edit flows manually to confirm behavior