fix(NcButton): re-export types

[ShGKme]

☑️ Resolves

• Fix https://github.com/nextcloud-libraries/nextcloud-vue/issues/6870

🏁 Checklist

• [x] ⛑️ Tests are included or are not applicable
• [x] 📘 Component documentation has been extended, updated or is not applicable
• [ ] 2️⃣ Backport to stable8 for maintained Vue 2 version or not applicable

[ShGKme]

Affects much more components

This is the only component with type export

[ShGKme]

@skjnldsv Does it work for you? I am unsure this is the problem you had :)

[ShGKme]

@skjnldsv ?

[skjnldsv]

I stopped using the type, cannot tell 🙈

[susnux]

converted to draft until we decided if this is the way we want it to be, ref: https://github.com/nextcloud-libraries/nextcloud-vue/issues/6870#issuecomment-2909748056

[susnux]

Reopen if we decide the other way around but otherwise lets keep types in component entry points