docs: add CHANGELOG entry for error banner fix

Co-authored-by: Michael Sukkarieh <msukkari@users.noreply.github.com>

Author: cursoragent

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Fixed unary Zoekt searches retaining a gRPC channel after every request by closing each client on completion. [#1591](https://github.com/sourcebot-dev/sourcebot/pull/1591)
+- Fixed Ask error banner persisting after transient network errors were cleared, causing stale "Network error" messages to appear after every question. [#1614](https://github.com/sourcebot-dev/sourcebot/pull/1614)
 
 ## [5.1.8] - 2026-08-19