refactor: combining shared code markdown renderer readme & changelog

[WilcoSp]

🔗 Linked issue

This pr is part of #501

🧭 Context

Currently changelog uses a seperate marked markdown renderer from readme, this pr takes the shared code and makes it into a "markdown kit" so that code that can be shared will be shared

📚 Description

Moves shared code for both changelog & readme to a shared markdown kit while still allowing for each to have their unique needs.

additional changes

• Heading have been changed to be more consistent and easier to use by users to the following:
  ## heading -> <hx><a href="#...>heading</a></hx>
## [Example](https://example.com) -> <hx><a href="https://example.com">Example</a><a href="#...></a></hx>
• Tests have been added for the changelog markdown renderer for what not shared or changed for changelog.
• Thanks to the tests also some bugs have been fixed.
• Also for changelog.md the jumping to the requested version has been fixed, now if "3.5.1" is requested then "3.5.11" won't be selected.
• 502 will now only be returned when ungh.cc is exhausted, others have been changed to 500
• at package.takumi.vue & externallinks.vue the provider icons are now given via the useProviderIcon composable
• fixed a bug to where when switching between package tabs that the message "package doesn't have changelogs" is being shown while earlier it did have it.
• some further smaller refactors

AI usage

For app/utils/header-version-matcher.ts I've used Gemini to get the regex for matching more exact the requested version in a toc item text

notes

The branch of this pr was based on #1233 initially, that's why there are so many commits, file changes does show correctly what has changed

[vercel]

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Project	Deployment	Actions	Updated (UTC)
npmx.dev	Ready	Preview, Comment	May 14, 2026 10:08am

2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs.npmx.dev	Ignored	Preview	May 14, 2026 10:08am
npmx-lunaria	Ignored		May 14, 2026 10:08am

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[codecov]

Codecov Report

❌ Patch coverage is 71.56398% with 60 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
server/utils/mdKit.ts	69.28%	21 Missing and 26 partials ⚠️
server/utils/changelog/markdown.ts	66.66%	5 Missing and 4 partials ⚠️
app/components/Package/Header.vue	50.00%	0 Missing and 1 partial ⚠️
app/composables/usePackageChangelog.ts	85.71%	0 Missing and 1 partial ⚠️
app/composables/useProviderIcon.ts	0.00%	0 Missing and 1 partial ⚠️
app/utils/router.ts	50.00%	1 Missing ⚠️

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