feat: changelogs within npmx

[WilcoSp]

This pr will add the possibility to view the changelog.md & releases from a package's github (maybe others) repo within npmx.
This will make it easier to see the changelogs while not needed to leave npmx and allowing quicker access.

This pr is the first pr of #501

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Currently this pr is in draft mode to allow for previewing while I still work on this pr.

If you've feedback about this pr leave a comment behind.
if you wish something to be added, please check & comment at #501

[vercel]

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Project	Deployment	Actions	Updated (UTC)
docs.npmx.dev	Error		Feb 20, 2026 10:20pm
npmx.dev	Error		Feb 20, 2026 10:20pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
npmx-lunaria	Ignored		Feb 20, 2026 10:20pm

[github-actions]

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[codecov]

Codecov Report

❌ Patch coverage is 47.05882% with 9 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
app/composables/usePackageChangelog.ts	0.00%	5 Missing and 1 partial ⚠️
app/pages/package/[[org]]/[name].vue	0.00%	3 Missing ⚠️

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[gwennlbh]

i have good feedback! it works fine on https://npmxdev-git-fork-wilcosp-feat-changelog-1-npmx.vercel.app/package-changes/swarpc/v/0.19.0

its not really a "stress-test" per se (as I have a tool that manages the changelog for me, so it stritctly adheres to the KAC standard), but theres a few code blocks, strong-within-code tag once, etc. version splitting works fine, and the per-version outline menu is nice ^^

edit: uhhh as it turns out i also copy paste the changes in the github releases tab so its not really testing that oops

[gwennlbh]

also, i have to admit that it took me quite some time to find the changelog button, i intuitively looked around the "Versions" section

i think it could be added either on each version or next to (while keeping it aligned but you get me) the community adoption button