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Improve error handling and UI responsiveness #11

@dsmithnautel

Description

@dsmithnautel

Summary

Enhance user experience with better error handling, loading states, and responsive feedback.

Tasks

Error Handling - Backend

  • Standardize error response format across all endpoints
  • Add descriptive error messages for common failures
  • Handle Gemini rate limiting gracefully with clear user message
  • Handle MongoDB connection errors
  • Input validation with helpful error messages

Error Handling - Frontend

  • Global error boundary for React
  • Toast notifications for errors and success
  • Retry buttons for failed operations
  • Clear error messages (not technical jargon)

Loading States

  • Skeleton loaders for content loading
  • Progress indicators for long operations (PDF processing)
  • Estimated time remaining for Gemini calls
  • Disable buttons during async operations

Responsive Design

  • Mobile-friendly layouts
  • Touch-friendly interactions
  • Responsive typography and spacing
  • Test on various screen sizes

User Feedback

  • Success confirmations after actions
  • Validation feedback on forms (inline errors)
  • Empty states with helpful guidance

Priority

High - critical for good demo and user experience

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