chore: bump version to 0.4.4

package.json had drifted out of sync with git tags since v0.4.0
(tags were cut without a matching package.json bump); this catches
it up and covers the bookmark links-list feature.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WpxhtQY3CExQdMs4j7MmJe

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pulsenode",
-  "version": "0.3.0",
+  "version": "0.4.4",
   "private": true,
   "scripts": {
     "dev": "tsx watch server.ts",