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Add PageLoader to run tests w/ JSDOM & the browser

PageLoader, in test-helpers.js, enables running the same tests whether
running in Node with JSDOM or running in a browser. It also provides
PageLoader.closeAll() for easy afterEach() cleanup.

Its JsdomPageLoader contains the previous loadFromFile() and
importModules() logic from main.test.js. It's also redesigned to be much
more consistent, as extensively documented in the comments.

Now it's possible to run the tests using the Vitest browser runner via:

  pnpm test -- --browser.name=chrome

(Or "firefox"; "safari" seems a bit broken at the moment.)

---

However, it's not yet possible to run headless via:

  pnpm test -- --browser.name=chrome --browser.headless

This is because this change adds @vitest/browser v0.34.6, the latest non
beta version, which doesn't contain:

- https://github.com/vitest-dev/vitest/pull/4364

That PR passes the options that enable headless mode through to the
BrowserProvider implementations, thus closing:

- https://github.com/vitest-dev/vitest/issues/3930

However, the change is only present from v1.0.0-beta.3:

- https://github.com/vitest-dev/vitest/commit/5cdeb558c
- https://github.com/vitest-dev/vitest/releases/tag/v1.0.0-beta.3

I'll try updating to v1.0.0-beta.4 (the latest at this time). If that
works, I'll commit it.

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