feat: Add interactive dropdown navigation to SpaceBreadcrumb

[spencrmartin]

• Enhanced SpaceBreadcrumb with dropdown menus for Spaces and Rooms
• Users can now click Space/Room names to see and switch between options
• Added visual improvements: Layers icon for Spaces, ChevronDown indicators
• Implemented click-outside-to-close and smooth animations
• Added accessibility features: ARIA labels, keyboard navigation
• Integrated room switching in TabbedChatContainer
• Added comprehensive documentation in BREADCRUMB_DROPDOWN_FEATURE.md

Key Features:

• Space dropdown: View and navigate to all available Spaces
• Room dropdown: View and switch between rooms in current Space
• Current Space/Room highlighted with accent color
• Member counts displayed for context
• Smooth Framer Motion animations
• Full keyboard and screen reader support

Summary

Type of Change

• [ ] Feature
• [ ] Bug fix
• [ ] Refactor / Code quality
• [ ] Performance improvement
• [ ] Documentation
• [ ] Tests
• [ ] Security fix
• [ ] Build / Release
• [ ] Other (specify below)

AI Assistance

• [ ] This PR was created or reviewed with AI assistance

Testing

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Discussion: LINK (if any)

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