feat: add CliStreamMonitor and related components for CLI output streaming

- Implemented CliStreamMonitor component for real-time CLI output monitoring with multi-execution support.
- Created JsonFormatter component for displaying JSON content in various formats (text, card, inline).
- Added utility functions for JSON detection and formatting in jsonUtils.ts.
- Introduced LogBlock utility functions for styling CLI output lines.
- Developed a new Collapsible component for better UI interactions.
- Created IssueHubPage for managing issues, queue, and discovery with tab navigation.

ccw/frontend/src/pages/index.ts

@@ -11,6 +11,7 @@ export { SessionDetailPage } from './SessionDetailPage';
 export { HistoryPage } from './HistoryPage';
 export { OrchestratorPage } from './orchestrator';
 export { LoopMonitorPage } from './LoopMonitorPage';
+export { IssueHubPage } from './IssueHubPage';
 export { IssueManagerPage } from './IssueManagerPage';
 export { QueuePage } from './QueuePage';
 export { DiscoveryPage } from './DiscoveryPage';