Fix @dagrejs/dagre "module is not defined" SSR error

Move @dagrejs/dagre to ssr.external instead of ssr.optimizeDeps.include.
The experimental ssr.optimizeDeps pre-bundling wasn't converting the
CJS module to ESM. Externalizing lets Node.js load it natively as CJS.

Author: techniq

docs/vite.config.ts

@@ -96,13 +96,8 @@ export default defineConfig({
 		// Disabled during tests to avoid "Failed to load source map" warnings (e.g. typescript.js.map)
 		// Ref: https://github.com/vitest-dev/vitest/issues/6806
 		noExternal: isTest ? undefined : true,
-		// satori and @resvg/resvg-js have CJS dependencies that need to be loaded as external
-		external: ['satori', '@resvg/resvg-js'],
-		// @dagrejs/dagre is CJS-only and fails with "module is not defined" when
-		// bundled for SSR. Pre-bundling converts it to ESM so it works both in
-		// dev and in the production build (where node_modules aren't available).
-		optimizeDeps: {
-			include: ['@dagrejs/dagre']
-		}
+		// CJS-only packages that fail with "module is not defined" in Vite's ESM
+		// module runner. Externalizing lets Node.js load them natively as CJS.
+		external: ['satori', '@resvg/resvg-js', '@dagrejs/dagre']
 	}
 });