The `StaticImport['imports']` type is incorrect

[kyleMessnerLillyContractor]

Environment

node: v22.22.3
mlly: 1.8.2

Reproduction

run findStaticImports('import "styles.css";')[0].imports and see that it is undefined

Describe the bug

Side effect imports are valid so the imports property should actually be optional but it's currently typed as a string.

When you parse something like import "styles.css"; the imports property will be undefined.

There is already a test case that covers side effect imports but it does not validate that the returned object matches the shape described by the type.

Additional context

No response

Logs