Refactor nav: horizontal top bar → sidebar layout
- Replace cramped horizontal nav with grouped sidebar navigation
- Sections: Monitor, Respond, Analyze with logical grouping
- Collapsible sidebar with localStorage persistence
- Tooltips on hover when collapsed (icon-only mode)
- Slim top bar: search, alerts bell, help, theme toggle, user menu
- Org switcher + settings pinned to sidebar bottom
- Mobile: grouped slide-out panel matches sidebar sections
- Smooth CSS transitions on collapse/expand
Graham McIntie
5a8e3885a9