gui: Fix grid misalignment due to split pane slider
Context
Fix several grid sizing issues:
- Grid slighly deforming at every resize (linked to !38 (merged))
- Grid not perfectly centered by a few pixels (linked to !38 (merged))
- Grid deforming when size becomes too small (long-standing)
What has changed?
Main Changes
gui
- Take into account padding in
CrosswordGridPane
max size definition - Remove split pane slider padding so that grid is properly centered
- Set a minimal size to box cells