Completions for module names should be case-insensitive

<img width="1334" height="192" alt="Image" src="https://github.com/user-attachments/assets/c996daf1-aa53-4498-9f83-c57e9ccd8698" />

But I am looking for `StackAnnotation.hs`!

<img width="1336" height="166" alt="Image" src="https://github.com/user-attachments/assets/c7526234-2f8b-4f00-a5bf-b645c93347c6" />

Module name completions should maybe be case-insensitive.