Schema with same enum will generate incorrect code

Hi!

A schema like this:

```json
{
"properties": {
"my_field": { "enum": ["first", "second", "third"] }
},
"optionalProperties": {
"another_field": { "enum": ["first", "second"] }
}
}
```

Will generate two types for the enums:

```gleam
pub type Data {
Data(
my_field: DataMyField,
another_field: DataAnotherField,
)
}

pub type DataMyField {
Paragraph
Table
Heading
}

pub type DataAnotherField {
Paragraph
Table
}
```

Which is invalid Gleam code. I think the solution would be to suffix every cases with the type name?

Use the JSON schema in the issue as the reproduction input and inspect the generated Gleam output for the two enum types. Trace the generator entry point that derives enum type and case names, then verify that the output contains distinct valid constructors for both fields.

Written by the indexing model from the issue text.