- Replace individual page background images with global page background in App.vue
- Update pages.json global styles to use transparent colors for navigation and backgrounds
- Remove redundant bg-image elements and styles from all page components
- Set global page background with login_bg.png image, cover sizing, and fixed attachment
- Simplify individual page styling by removing duplicate background color declarations
- Consolidate background management to single source of truth in App.vue for consistent theming
- Add inline editing UI for mileage correction field in fault detail page
- Implement save/cancel buttons for mileage correction updates
- Add updateMileageCorrection API endpoint and service method
- Update App.vue global styles with page background color
- Enhance pages.json with backgroundColorTop and backgroundColorBottom
- Add MileageCorrectionDto for request validation
- Implement batch fault times retrieval for export functionality
- Add fault frequency time concatenation in export data
- Improve export data structure with complete fault history information
