Interaction does not work in preview

Reproduction steps:

• Install project
• Run sourcey dev

Expected behavior:

Preview/dev server to display the documentation exactly how it is going to be presented after being built

Actual behavior:

No interaction works on the website. Scrollspy, search, drop-downs, etc.

Relevant logs

There are no errors in the console, no logs, no failed network requests. Only these warnings in the console:

Failed to resolve dependency: preact, present in client 'optimizeDeps.include'
Failed to resolve dependency: preact/jsx-runtime, present in client 'optimizeDeps.include'
Failed to resolve dependency: preact/jsx-dev-runtime, present in client 'optimizeDeps.include'
Failed to resolve dependency: preact/debug, present in client 'optimizeDeps.include'
Failed to resolve dependency: preact/devtools, present in client 'optimizeDeps.include'

Configurations

package.json:

{
  "name": "api-docs",
  "private": true,
  "type": "module",
  "version": "1.0",
  "packageManager": "pnpm@12.3.4",
  "engines": {
    "node": ">=24"
  },
  "scripts": {
    "preview": "sourcey dev",
    "build": "sourcey build"
  },
  "devDependencies": {
    "sourcey": "^3.6.5"
  }
}

sourcey.config.ts:

import { defineConfig, markdown, openapi } from "sourcey";

export default defineConfig({
  name: "API",
  theme: {
    preset: "default",
  },
  navigation: {
    tabs: [
      {
        tab: "Documentation",
        slug: "",
        source: markdown({
          groups: [
            {
              group: "Getting started",
              pages: ["introduction"],
            },
          ],
        }),
      },
      {
        tab: "API Reference",
        slug: "api",
        source: openapi("../api/openapi.yml"),
      },
    ],
  },
});

Reproduce the issue with the package.json scripts by running sourcey dev against the shown sourcey.config.ts, then investigate the reported unresolved Preact dependencies. Done means preview interactions such as Scrollspy, search, and dropdowns work without console or network errors.