Create new before-save hook (validation)

1. If there is a need to validate values before saving - it is possible to use before-save hooks in the form
2. For example, let's add a hook for timelog and check it has long description on how this time was spent
3. In VS Code - open views/ui-code/index.ts and update the following:

beforeSave() {
    entity.title ||= '(empty)';
    if (entity.title.length < 50) {
        throw 'Error: please provide longer task description - minimum 50 characters';
    }
}

4. Publish the app and try saving the timelog with the short explanation - the form will not save: