Sprite width/height stay fractional. They are geometry, not counts: the
aspect-ratio buttons compute height * w/h and legitimately produce values like
9.090909090909092 (compared with a 1e-9 tolerance), and both axes are scrubbable.
Rounding them would break the ratio the buttons just established.
Only fields that are integral by meaning round (slice grid, frame rect, camera
view, font size) - that is what 1b16a55 fixed.
