[julien-deramond]

On main, npm run docs-serve loads the docs pages, but their scripts don't run. The browser console shows:

Uncaught SyntaxError: The requested module '/@fs/…/node_modules/clipboard/dist/clipboard.js' does not provide an export named 'default'

site/astro.config.ts excludes @twbs/bui from Vite's dependency pre-bundling, so Vite serves bui's sources as they are. Its src/browser/clipboard.ts imports the clipboard package, which only ships CommonJS, and the browser can't read a default export from it. The module fails to load, and the docs scripts that import it stop with it, so the copy buttons do nothing in dev. npm run docs-build isn't affected, because the production build bundles everything.

This PR adds @twbs/bui > clipboard to optimizeDeps.include. Vite pre-bundles clipboard on its own and turns it into an ES module with a default export, while the rest of @twbs/bui is still served from source. The production build doesn't change.

I checked it with @twbs/bui 0.1.4 and Astro 7.3.8, starting from an empty Vite cache. On main, the Button page throws the error above and its copy buttons never get their tooltip. With this change the error is gone, and clicking a copy button shows "Copied!". npm run docs-build passes.

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