Soften updater stub messaging (no error)

pikit-web/data/mock-update-status.json

@@ -0,0 +1,10 @@
+{
+  "current_version": "0.1.0-dev",
+  "latest_version": "0.1.1-mock",
+  "last_check": "2025-12-10T22:00:00Z",
+  "status": "update_available",
+  "message": "New UI polish and bug fixes.",
+  "auto_check": true,
+  "in_progress": false,
+  "progress": null
+}