feat(auto-mode): enhance error handling and feature status updates

- Improved error handling in AutoModeService to log errors and update feature status to "waiting_approval" when an error occurs during feature execution.
- Added error message writing to the context file for better debugging.
- Updated FeatureLoader to include an optional error message parameter when updating feature status.
- Enhanced prompt generation to include detailed context about attached images for better user guidance during feature implementation.
- Modified KanbanCard component to visually indicate features with errors, improving user awareness of issues.

These changes significantly enhance the robustness of the auto mode feature and improve the user experience by providing clearer feedback on feature execution status.

app/src/store/app-store.ts

@@ -86,6 +86,7 @@ export interface Feature {
   startedAt?: string; // ISO timestamp for when the card moved to in_progress
   skipTests?: boolean; // When true, skip TDD approach and require manual verification
   summary?: string; // Summary of what was done/modified by the agent
+  error?: string; // Error message if the agent errored during processing
 }
 
 export interface AppState {