perf: omit unused UI CSS and minify final bundles

packages/cli/src/build.ts

@@ -40,6 +40,7 @@ import {
   headToString,
   renderProductionFontHead,
   findStyleEntry,
+  bundleCss,
   renderStyles,
   resolveThemeConfig,
   renderThemeCss,
@@ -401,12 +402,16 @@ export async function runBuild(appRoot: string): Promise<void> {
   console.log(`✓ Theme:   ${theme.names.length} themes (default: ${theme.default})`);
 
   // 1a2) Wire UI stylesheet (all component classes, themed via tokens).
-  const uiStyles = uiCss();
+  const uiStyles = config.styles?.includeUi === false ? "" : uiCss();
   writeFileSync(join(distDir, "ui.css"), uiStyles, "utf8");
   const frameworkStyles = `${themeCss}\n${uiStyles}`;
   writeFileSync(join(distDir, "framework.css"), frameworkStyles, "utf8");
   assetHash.update(uiStyles);
-  console.log(`✓ UI:      dist/ui.css + framework.css`);
+  console.log(
+    config.styles?.includeUi === false
+      ? `✓ UI:      omitted by styles.includeUi`
+      : `✓ UI:      dist/ui.css + framework.css`,
+  );
 
   // 1a3) Validation: bake schema descriptors into the client script.
   const descriptors: Record<string, SchemaDescriptor> = {};
@@ -447,8 +452,12 @@ export async function runBuild(appRoot: string): Promise<void> {
       },
       config.styles,
     );
-    assetHash.update(css);
-    const combinedCss = `${frameworkStyles}\n${css}`;
+    const combinedSource = `${frameworkStyles}\n${css}`;
+    const combinedInput = join(distDir, ".wrnexus-combined.css");
+    writeFileSync(combinedInput, combinedSource, "utf8");
+    const combinedCss = await bundleCss(combinedInput, "production");
+    rmSync(combinedInput, { force: true });
+    assetHash.update(combinedCss);
     // One blocking CSS request in production: tokens → UI → application CSS.
     // The standalone framework.css remains available for apps without global CSS.
     writeFileSync(join(distDir, "styles.css"), combinedCss, "utf8");