FWI-FE-405: Use loading and error states from ML prediction API calls

[donkasun]

Description

Integrate loading and error states throughout the application. Show LoadingOverlay during ML predictions, display ToastNotifications for results, and handle error recovery. Implement graceful degradation when ML services are unavailable.

Dependencies

• FWI-FE-402 (ControlPanel updates)
• FWI-FE-403 (LoadingOverlay component)
• FWI-FE-404 (ToastNotification component)

Acceptance Criteria

• Integrate loading states throughout application
• Show LoadingOverlay during ML predictions
• Display ToastNotifications for results
• Handle error recovery mechanisms
• Implement graceful degradation
• Handle ML service unavailability
• Add error state management
• Include user feedback and guidance

Technical Notes

• Use React context for state management
• Implement proper error boundaries
• Add fallback UI components
• Consider offline functionality

[donkasun]

Related to EPIC-4: Results Visualization #18

[donkasun]

Parent Epic: #18 - EPIC-4: Results Visualization