chore: checkpoint related UI improvements and supporting components

Various supporting changes made during the assign archetypes feature development:

- Added contextual-right-panel.tsx and swarm-command-feed.tsx
- Updated activity-panel.tsx with new features
- UI improvements to left-panel, mobile-nav
- Test updates for url-state-integration, mobile-nav, top-bar
- Package.json updates for dependencies
- Global CSS refinements

These changes support the main assign archetypes feature but are
not directly part of its core functionality.

src/components/graph/dependency-graph-page.tsx

@@ -533,6 +533,7 @@ export function DependencyGraphPage({
           isCycleNode: cycleNodeIdSet.has(issue.id),
           isDimmed: selectedId ? !chainNodeIds.has(issue.id) : false,
           blockerTooltipLines: externalBlockerNames.get(issue.id) ?? blockerTooltipMap.get(issue.id) ?? [],
+          labels: issue.labels,
         },
         position: { x: 0, y: 0 },
         sourcePosition: Position.Right,