chore: prepare release 20260818.04

Author: penso

CHANGELOG.md

@@ -19,6 +19,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Security
 
+## [20260818.04] - 2026-08-18
+### Fixed
+- [web] Cover bare session refreshes in midnight E2E
+
 ## [20260818.03] - 2026-08-18
 ### Fixed
 - [sandbox] Support Podman escape hatches (#1106)