BooleanMetaDataField unexpected behavior

[EnriColombo]

Bug report

Describe the bug

Unexpected behavior of BooleanMetaDataField in case both 'value' and 'isRequired' parameters are set to 'true'.

To Reproduce

Inside a SupaEmailAuth widget introduce a BooleanMetaDataField, with both 'value' and 'isRequired' parameters set to 'true':

SupaEmailAuth(
  isInitiallySigningIn: false,
  // ...
  metadataFields: [
    BooleanMetaDataField(
      label: 'Sono un capitano',
      key: 'is_captain',
      checkboxPosition: ListTileControlAffinity.trailing,
      value: true,
      isRequired: true,
    ),
  ],
)

Initially submitting the form without interacting with the checkbox, the error 'This field is required' is displayed.
You need to uncheck and re-check the checkbox to submit it correctly.

Expected behavior

I'd expect no interactions by the user at all if the checkbox is already checked and it's required.

Screenshots

System information

• OS: Android 11
• Dart SDK version: 3.8.1 (stable) (Wed May 28 00:47:25 2025 -0700) on "linux_x64"
• Flutter 3.32.1
• DevTools 2.45.1
• Version of supabase_flutter: 2.9.1
• Version of supabase_auth_ui: 0.5.5