- Add mobile responsive CSS rules for ProjectOverview component
- Add mobile breakpoint styles for card layouts and navigation elements
- Add ProjectOverview mobile structure tests for responsive behavior
- Add ProjectCard mobile visibility tests
- Add node API typings and client methods plus a polling useNodes hook with visibility-triggered refresh
- Introduce NodesView with NodeCard, AddNodeModal, and NodeDetailModal to register, inspect, update, health-check, and remove nodes
- Wire the Nodes surface into the app shell/header and add project node assignment UI with project card node badges
- Add unit coverage for useNodes, NodesView, NodeCard, Header, and ProjectCard behavior, plus node-specific dashboard styling
- Import getDefaultProject from project-context.js instead of duplicating
- Remove local getDefaultProject implementation in project.ts
- All 6 tests still passing
