FORM-003: form has no button

Warning: the page still builds, but this is most likely a mistake.

Without a button, a form can be sent only by pressing Enter in a field, which few people know and which doesn't work in every form. AI agents look for the button too.

Fails

page(title: "Shoes", description: "All our running shoes, from light racers to trail shoes.") {
  h1 "Shoes"
  form("/newsletter", name: "newsletter") {
    field("email", type: Email, label: "Email")
  }
}

warning[FORM-003]: form has no button to submit it
 --> page.hypra:3:3
  |
3 |   form("/newsletter", name: "newsletter") {
  |   ^^^^
  = help: add button "Send"
  = docs: https://hypralang.dev/rules/form-003/

0 errors, 1 warning

Fixed

page(title: "Shoes", description: "All our running shoes, from light racers to trail shoes.") {
  h1 "Shoes"
  form("/newsletter", name: "newsletter") {
    field("email", type: Email, label: "Email")
    button "Subscribe"
  }
}