Implement Comprehensive Error Handling

[DrunkOnJava]

⚠️ Error Handling and Recovery Implementation

Current State

• Basic error properties in ViewModels
• No user-friendly error messages
• No error recovery mechanisms
• Missing offline mode handling

Required Implementation

1. Error Types and Messages

   • Create AppError enum with cases
   • Localized error descriptions
   • User-friendly error messages
   • Error recovery suggestions

2. Error UI Components

   • Error banner/toast system
   • Inline error states
   • Full-screen error views
   • Retry mechanisms

3. Offline Mode

   • Detect network connectivity
   • Queue operations for sync
   • Offline mode indicators
   • Sync conflict resolution

4. Error Analytics

   • Error logging system
   • Crash reporting integration
   • Error frequency tracking
   • User error reports

Implementation Example

enum AppError: LocalizedError {
    case networkUnavailable
    case syncConflict(Item, Item)
    case storageQuotaExceeded
    case corruptedData(String)
    
    var errorDescription: String? { ... }
    var recoverySuggestion: String? { ... }
}

Acceptance Criteria

• All errors have user-friendly messages
• Offline mode works seamlessly
• Error recovery options available
• No silent failures

Parent Epic

Related to #106 (UI/UX Gaps) and #109 (Performance)

[DrunkOnJava]

Closing: This issue has been resolved/superseded by the complete modular architecture restructure now in main branch (commit 33a0ead). The new architecture implements a comprehensive solution that addresses the core needs this issue was tracking.