Replace vite-plugin-node-polyfills with @rolldown/plugin-node-polyfills

[Copilot]

vite-plugin-node-polyfills is incompatible with Vite 8's Rolldown bundler. This switches to @rolldown/plugin-node-polyfills, the official Rolldown replacement.

Changes

• package.json: Remove vite-plugin-node-polyfills; @rolldown/plugin-node-polyfills was already added in the Vite 8 upgrade PR
• vite.config.ts:
  • Switch to default import from @rolldown/plugin-node-polyfills
  • Add enforce: "pre" — without it, vite:resolve/oxcResolvePlugin externalizes Node built-ins (buffer, path) before the polyfill's resolveId hook can intercept them, since Vite places its internal resolver between prePlugins and normalPlugins
  • Pass the plugin into scriptViteConfig and htmlViteConfig inside webExtension() — that plugin spawns separate Vite 6 sub-builds using its own bundled Vite instance, which don't inherit top-level plugins

// enforce: "pre" is required in both main config and sub-build configs
{ ...nodePolyfills(), enforce: "pre" as const }

The options.transform.inject returned by the plugin is Rolldown-specific and produces a harmless Unknown input options: transform warning in the Vite 6 Rollup sub-builds, but correctly injects Buffer/process/global shims in the main Vite 8/Rolldown build.

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[Rhilip]

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