Remove asset copy from build step

Fonts and CSS are resolved from source by Vite's client bundler
via SRC_DIR, so copying them to dist/ is unnecessary.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mattlenz

package.json

@@ -15,7 +15,7 @@
     "typecheck": "tsc",
     "prepublishOnly": "npm run build",
     "postinstall": "npm run build",
-    "build": "tsc -p tsconfig.build.json && cp -r src/vite/styles dist/vite/ && cp -r src/vite/fonts dist/vite/",
+    "build": "tsc -p tsconfig.build.json",
     "dev": "npm run build && kb dev",
     "build:docs": "npm run build && kb build"
   },