Base: Element X Android release/26.10.0, 21a94116.
Build: JDK 21, Android SDK 37, ./gradlew :uipreview:assembleRelease
Lightweight offline UI preview launcher: ChatUiPreviewActivity, sharing the full app debug fixture source and production HomeView/MessagesView/PreferencesRootView.
Separate package com.zjrs.chat.preview; no member auth bridge or real chat. The complete Matrix client source remains in :app.
Do not use test signing material for production.
