feat: add Team Node Drawer with Enhanced People Management

[tataihono]

What's Changed:

• New Team Node Drawer: Added a slide-out drawer that displays detailed team information when clicking on team nodes
• Context Management: Implemented React Context (PathwayContext) to manage selected team node state across components
• Enhanced People List: Redesigned people list with better visual hierarchy, avatars, and improved filtering capabilities
• Interactive Team Nodes: Team nodes now show selection state and trigger the drawer instead of expanding inline
• Responsive Layout: Flow container adjusts width when drawer is open to prevent overlap

Key Features:

• Click any team node to open a detailed drawer view
• Search and filter people by name, CG group, and serving status
• Sticky filter bar for better UX when scrolling through long lists
• Smooth animations and transitions throughout the interface

Technical Improvements:

• Replaced inline node expansion with dedicated drawer component
• Added proper state management using React Context + useReducer
• Improved component architecture with better separation of concerns
• Enhanced accessibility with proper ARIA labels and keyboard navigation

The changes transform the team node interaction from inline expansion to a more professional drawer-based interface, making it easier to view and manage team member information.