feat: Added package capacity preview script

Author: klmhyeonwoo

package.json

@@ -85,7 +85,7 @@
     "build": "tsc && vite build",
     "build:analyze": "npm run build && npm run analyze:bundle",
     "analyze:bundle": "echo 'Bundle Analysis:' && du -h dist/bundle/* && echo '\\nGzipped sizes:' && gzip -c dist/bundle/kr-corekit.js | wc -c | awk '{print \"ESM: \" $1/1024 \" KB\"}' && gzip -c dist/bundle/kr-corekit.cjs | wc -c | awk '{print \"CJS: \" $1/1024 \" KB\"}'",
-    "preview": "vite preview",
+    "pack:preview": "npm pack --dry-run",
     "test": "vitest",
     "coverage": "vitest run --coverage"
   },