- Window manager store (Zustand) for managing open/minimized/fullscreen windows
- Window component with header controls: KI-Chat toggle, fullscreen, minimize, close
- AI chat panel with streaming chat via existing /ai/sessions API
- WindowContainer renders all non-minimized windows
- TopBar shows minimized windows as clickable pills
- ContactEditForm extracted from ContactEditModal for window rendering
- ContactsList and ContactDetailPage use openWindow() instead of modal state
- Draggable windows with z-index management
Agent Zero
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