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`pnpm docs:dev` rendered a blank page with `does not provide an export named 'default'` thrown from dayjs.min.js. Mermaid 11 ships its `dayjs`, `cytoscape`, `debug` and `@braintree/sanitize-url` dependencies with a CommonJS `main` field but no `default` ESM export. Vite's dev server resolves those modules eagerly as ESM and the browser throws on the first navigation. The production build (`docs:build`) was unaffected — Rollup's plugin pipeline already applies the CJS→ESM interop wrapper. This fix is exclusively for the dev happy path: `optimizeDeps.include` forces Vite to pre-bundle the Mermaid dependency tree, which applies the same interop shim at dev-server boot. Caught by manual smoke of the merged docs-site chantier — the build-time Mermaid-rendering fence in `.gitea/workflows/docs-site.yml` didn't catch this because it only inspects production HTML.