fix: scroll anchoring improvements for chat (#10600)
* remove extra states
* update width in story
* fix scroll jumping on mobile
* add tests
* fix scroll anchoring for when small chats resize
* comment updates
* fix execution trace from flashing when scrolling in virtualized container
* fix lint
* fix flashing dividers in response status
* cleanup
* feedback from copilot
* refactor anchor to bottom code
* fix formatting
* cleanup tests
* more cleanup
* remove isScrolling bc it's not sufficient enough for now
* fix formatting
* copilot written stories
* remove files that i did not mean to commit...
* update comment
* update chat story for mobile
* quick story fix
