- Add CSS media queries for all sections: sidebar overlay, navbar,
calendar, kanban, dashboard, list view, drawer, modal, reports,
team tasks, members
- Add hamburger menu button (hidden on desktop, visible on mobile)
- Add sidebar slide-in overlay with backdrop for mobile
- Auto-close sidebar on navigation for mobile UX
- Login card, drawer, and modal go full-width on mobile
- Dashboard stats grid collapses to 2-column on mobile
- Report charts stack to single column on mobile
- Login with role-based auth (CTO/Manager/Employee)
- Calendar view (month/week) with task chips and quick-add
- Kanban board with status columns
- Sortable list view with action menus
- Task detail drawer with subtasks, comments, activity
- Add task modal with validation
- Dashboard with stats, workload, priority breakdown
- Team tasks grouped by assignee
- Reports page with recharts (bar, pie, line, horizontal bar)
- Members page with invite modal
- Search and assignee filter across views
- ErrorBoundary for production error handling
- Full dark design system via index.css
