fix: community add-on template imports expect from vitest

[jycouet]

Closes https://github.com/sveltejs/svelte-ecosystem-ci/actions/runs/25781686887/job/75725574604 issue

Description

We use @playwright/test: ^1.59.1 and on npm i (in tests), it's taking the new https://github.com/microsoft/playwright/releases/tag/v1.60.0 . And the count of expect in vitest is not matching with this playwright change. Anyway, all our expects could be done via vitest, so let's switch to it

Checklist

• Update snapshots (if applicable)
• Add a changeset (if applicable)
• Allow maintainers to edit this PR
• I care about what I'm doing, no matter the tool I use (Notepad, Sublime, VSCode, AI...)

[changeset-bot]

🦋 Changeset detected

Latest commit: f0cd195

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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sv	Patch

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commit: f0cd195

[svelte-docs-bot]

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