9abeb829df
Chat embeds are plain iframes in the default session, and Electron allows a single onBeforeSendHeaders listener per webRequest hook — installRemoteHeaderRules registered its own listener on session.defaultSession, so a separate stamp there was silently discarded. Compose the stamp into the shared listener (belt-and-braces alongside the loopback renderer origin from the previous commit). Co-authored-by: Konstantin Khlopkov <konstantin.khlopkov93@gmail.com>