- Reduce UI element sizes to fit within screen bounds in fullscreen mode
- Add margins to fullscreen geometry to prevent window overflow
- Make log and copy progress text areas more compact
- Improve progress estimation to prevent jumping to 82% too quickly
- Use more conservative time estimates (50 MB/s instead of 100 MB/s)
- Cap data-based progress at 75% initially to prevent premature completion
- Add gradual progress completion at the end to avoid sudden jumps
- Reduce spacing and margins in layout for better screen fit

This ensures the fullscreen window fits properly on screen and provides
more accurate, gradual progress updates during the copy operation.