refactor!: move to module-runner

[lishaduck]

[!WARNING]

Breaking Change

Drop support for Vite <6

Overview

Drop vite-node in favor of Vite-native runnerImport, which is based on ModuleRunner.

Manual Testing

Good question... not entirely sure what fails the treeshake in the first place, but all the tests pass so I assume it loads the entrypoints at least. 🤷🏻‍♂️

Related Issue

Stacked on #1945. Supersedes/closes #1884.

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[aklinker1]

If tests pass, that should be good enough.

[lishaduck]

~~This PR is an absolute mess, but it works. Cleanup later if I have time, I need to hit the hay~~

I say that and then I whip out grbi. Life is better now, I can sleep in good conscience. Apparently the issue was that #1945 updated the locked vite version but didn't sync it right, which I tried to fix in here but downgraded instead of upgrading. Fixed that 😅 And guess what? Wouldn't have been (as much of) an issue if Vitepress used a peer... lol