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- ChatScreen: restructure to Box overlay layout so only input area rises with IME, messages stay fixed. Add opaque background to input area. Use reverseLayout with newest-first animation order. - OverlayContent: remove all manual IME detection — system forces adjust=pan on VoiceInteractionSession windows, so manual padding caused double offset. Let system handle IME naturally. - ChatRepositoryImpl: add messageRemovals flow to clean up wrapping stream_end/response when review/multi_message items arrive later. Track lastResponseId in both stream_end and response handlers. - ChatViewModel/OverlayViewModel: fix dedup to check by message ID only. Sort descending (newest first). Observe messageRemovals. - NavGraph: keep all tabs composed with graphicsLayer alpha toggle — prevents ChatScreen destruction and re-render on tab switch. - CyreneVoiceInteractionSession: defer configureWindow via post() to override system softInputMode flags. - AndroidManifest: set windowSoftInputMode=adjustNothing on main activity. - Add WebSocketKeepAliveService for background connection persistence. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>