Resolves #538.

## UI
### Updates & Improvements
- Auto-scroll now pauses when users scroll up during response
generation.
- A new user message will cause the thread to auto-scroll to the bottom
of the conversation continue scrolling as the next assistant response
streams in.
### Resolved Issues
- Fixed: When navigating to a second thread while a Thread Detail view
is open, the new thread content may not scroll to the bottom once fully
loaded.