feat: consume profile references in new-dataset dialog

Render reference-mode inputs, bind hasPart to data references, and validate required instances.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: St4NNi

.gitignore

@@ -6,5 +6,5 @@ aruna-portal-dist.tar.gz
 aruna-portal-dist.tar.gz.sha256
 portal-manifest.json
 .env
-.claude/settings.local.json
+.claude
 node_modules