fix: support vite 8

[Mythie]

Summary

• Add moduleType: "js" to the transform hook return value so Rolldown knows .po files are being compiled to JS
• Add ^8 to the vite peer dependency range

Problem

Vite 8 switched to Rolldown which auto-detects module types by file extension. .po files get assigned a non-JS module type, so when the plugin compiles them to ES modules, Rolldown chokes with TypeError: Cannot convert undefined or null to object.

Fixes #2473

What changed

packages/vite-plugin/src/index.ts — added moduleType: "js" to transform return. This is a standard Rolldown/Vite 8 convention documented in the migration guide. Safely ignored by older Vite versions.

packages/vite-plugin/package.json — peer dep vite now includes ^8.

Testing

All 9 existing tests pass. The moduleType property is ignored by Vite 3-7 so this is backwards compatible.

Also tested by patching https://github.com/documenso/documenso and running vite build over there when attempting the Vite@8 upgrade.

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