Improved HUD panel collapsing
Changed
- Clicking a header collapses or expands HUD panels while leaving only the top bar visible. Dragging still moves the window without collapsing it.
- Party and Battle List now have clear separators below the header and along the bottom edge.
Fixed
- Party member HP and mana bars now keep the correct height and accurately reflect their current values.
- Collapsed windows preserve their position and size across resolution changes and reopening, while expansion avoids overlapping other HUD panels.

