- Three-column layout on desktop (>900px): left sidebar, center area, right sidebar
- Left sidebar: user identity, nav tabs (公告栏/聊天), conversation history, settings
- Center area switches between announcements and chat views
- Right sidebar: always-visible team panel for controllers (founder/supreme/main)
- Chat history system with localStorage (zy_conversations, max 20 conversations)
- Announcements page with system info from brain files, tasks, quick actions
- Mobile responsive: left sidebar toggleable via hamburger menu
- Identity preview on setup screen with DEV-ID display
- All existing JS functions, API streaming, demo mode, brain loading preserved
- Version bumped from v3.1 to v4.0
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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