fix(ui-chat): preserve flow layout through slot anchors

scripts/no-unknown-casts.baseline.json

@@ -459,9 +459,6 @@
   "packages/client/ui-attachment/tests/composer-attachments.client.spec.tsx": {
     "ab22ebe23f59b5aa76d42502a0421f3953d1d170e8a4f900a0c442daf6f1397d": 1
   },
-  "packages/client/ui-chat/src/client/chat/ChatView.tsx": {
-    "50ce0a6085bdfd7032e5a391ed34cd078768ad8f46cc885eb54571cf8edd4bee": 1
-  },
   "packages/client/ui-chat/src/client/conversation-nodes/turn-process.ts": {
     "a7d8cc8d42e37ad5cc4882241492ac572ed8163c7fb8663180e893c7178e906f": 1
   },