Auto-refresh session tokens and inline error display

This release adds automatic JWT token refresh before chat requests and surfaces errors directly inside the chat interface.

Features

• Auto-refresh expired session tokens #1615  - Added automatic JWT expiry detection with a 30-second buffer, deduplicating concurrent refresh calls via fetchQuery and falling back to the stale token on failure. Refresh is automatic for non-static sessions and skipped during replays. (Author: @walker-tx )

Bug fixes

• Show Elements errors inside the chat #1633  - Errors now appear inline within the chat interface instead of failing silently. (Author: @chase-crumbaugh )