Fields Validation

User story

As a user, I want to be notified when I enter invalid input in the input fields so that I can correct my mistakes.

Acceptance criteria

• The title field should be required and show an error message if left blank.
• The category field should be preselected to "Personal" to avoid not selecting any category.
• The description field should have a maximum length of 200 characters.
• The app should prevent the user from submitting the form if there are any validation errors.