Broken anchoring to headers on package reademe page

[BANOnotIT]

Describe the bug

Header has lowercased id but the link does not lowecase it fully.

Reproduction:

1. Got to https://npmx.dev/package/fishery/v/2.4.0#user-content-build-api
2. Click on "Associations section"
3. Check window URL is https://npmx.dev/package/fishery/v/2.4.0#user-content-Associations
4. Change it to https://npmx.dev/package/fishery/v/2.4.0#user-content-associations (notice lowercased "associations") and see the browser navigates to the correct place

Additional context

No response

Logs

[alfonsusac]

What browser are you using? I couldn't reproduce this behavior.
Browser I've tried: Edge, Safari, Mozilla.

Screen.Recording.2026-04-05.at.12.31.59.PM.mov

[ghostdevv]

@alfonsusac you can reproduce it on the link in the markdown

[alfonsusac]

Got it. So for clarity so the reproduction steps are:

1. Go to https://npmx.dev/package/fishery/v/2.4.0#user-content-build-api
2. Click on "Associations" in the readme.me markdown under the second list
3. Check window URL is https://npmx.dev/package/fishery/v/2.4.0#user-content-Associations
4. Change it to https://npmx.dev/package/fishery/v/2.4.0#user-content-associations (notice lowercased "associations") and see the browser navigates to the correct place

[trivikr]

A fix is under review at #2385