- Add POST /upload endpoint to server.py (saves to photos/ dir)
- Add DELETE /photos/ endpoint for photo removal
- Replace base64 photoData with server-stored photoPath
- Export/import uses path string instead of large base64 data
- Add compressImage(): resize to max 400px width, JPEG quality 0.5
- Replace FileReader with canvas-based compression in handlePhotoUpload
- Add try-catch in export with alert on overflow
- Add permanent: true to tooltip (always visible speech bubble)
- Add CSS class flag-marker-tooltip with 1.2em font size
- Use white-space: nowrap to prevent word wrapping
- Remove number duplication from tooltip (number is on circle icon)
- Change tooltip direction from top to right
- Only show tooltip when flag.name exists
