fix(ui): use tsc for declarations to avoid memory issues in CI

The rollup-plugin-dts used by tsup runs out of memory with 54 entry points.
Split build into two steps:
1. tsup for ESM bundles
2. tsc --emitDeclarationOnly for .d.ts files

packages/ui/package.json

@@ -240,7 +240,7 @@
     "dist"
   ],
   "scripts": {
-    "build": "NODE_OPTIONS='--max-old-space-size=4096' tsup",
+    "build": "tsup && tsc --emitDeclarationOnly --declaration --outDir dist",
     "dev": "tsup --watch",
     "test": "vitest run",
     "test:ui": "vitest --ui",

packages/ui/tsup.config.ts

@@ -47,13 +47,9 @@ entries.push('src/system/hooks/useDitherAnimation.ts');
 export default defineConfig({
   entry: entries,
   format: ['esm'],
-  dts: {
-    // Reduce memory usage in CI by disabling concurrent workers
-    // This prevents "JS heap out of memory" errors when building many components
-    compilerOptions: {
-      composite: false,
-    },
-  },
+  // DTS disabled - using tsc directly to avoid memory issues with rollup-plugin-dts
+  // See build script: "tsup && tsc --emitDeclarationOnly"
+  dts: false,
   clean: true,
   treeshake: false, // Disable treeshaking to preserve 'use client'
   splitting: false,