Релиз-ноты

Fuel Tracking
- Added full fuel expense management: list, create, edit, delete
- Added detailed fuel entry screen
- Added quick access to fuel section from car details

Repairs Export
- Added repairs export in CSV, JSON, XLSX, and XLS
- Improved opening and sharing exported files

Statistics
- Added fuel-related metrics
- Added combined blocks: repairs + fuel
- Empty statistics now correctly shown as 0/-

Car Details Navigation
- Replaced preview sections with quick navigation buttons:
- Repairs
- Fuel expenses
- Documents
- Notes

Add Menu
- Add button now opens an action selection menu
- Improved alignment, spacing, and icon color system

Input Convenience
- Repair form now pre-fills current mileage
- Fuel form now pre-fills mileage, fuel type, and last known price

Fixes and Stability
- Fixed open/close flows for forms launched from Add menu
- Improved navigation stability
- Optimized statistics and data loading scenarios