feat(messenger): attachments in chat — upload, send, and render

CrmMessagingAdapter now implements upload() (presign-upload → PUT → presign-download
→ Attachment with contentRef), so the composer's attach button appears; send()
forwards the attachment to the socket; and incoming messages (history + realtime)
resolve a presigned display URL. Pull SDK 0.1.4.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "@abe-kap/appshell-sdk": "^0.2.6",
     "@insignia/iios-kernel-client": "^0.1.4",
-    "@insignia/iios-messaging-ui": "^0.1.3",
+    "@insignia/iios-messaging-ui": "^0.1.4",
     "clsx": "^2.1.1",
     "lucide-react": "^1.21.0",
     "next": "16.2.9",