The movestate property sat on the spinbox's inner QLineEdit, which both
themes deliberately paint transparent (QAbstractSpinBox QLineEdit rule)
- the state machine worked but no color ever showed, and the tests only
asserted the property, not the paint. The property now lives on the
spinbox itself with QAbstractSpinBox[movestate=...] added to both
themes' rules, verified by a pixel-sampling regression test that grabs
the rendered widget through the real stylesheet.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>