Diff headers sort is case sensitive

[novitae]

Description

When comparing two requests in the diff menu, the headers if they don't have the same case, won't compare, and show a big red and green difference.

As you can see on the right part of the pic, the header key "accept" is after "Pragma". Same for all the lowercase headers. This happens because it is "accept" and not "Accept". This is super annoying to compare two requests headers.

Steps to Reproduce

1. Make a request to whatever.
2. Add it to the diff.
3. Edit and replay the request after changing the headers to full lowercase.
4. Add the this new request to the diff.

Current Behavior

The diff will show a huge difference, while it's the just the headers keys case changing.

Expected Behavior

Should be ignoring the case of keys.

Environment

• App version: 5.14.0
• macOS version: 15.1.1