Desktop: Accessibility: Disable the loading animation when 'reduce motion' is enabled

[personalizedrefrigerator]

Summary

Disables a spinning animation on the loading indicator when the "reduce motion" setting (usually enabled from system settings) is enabled.

Related:

• WCAG Techniques: prefers-reduced-motion
• WCAG 2.2: Animation from Interactions (AAA) and WCAG 3 (draft): Avoid visual motion.

Testing

1. Import a JEX notebook. Verify that the loading indicator is visible and spins.
2. From the developer tools, enable "reduce motion" (ctrl-p > > emulate CSS prefers-reduced-motion reduce)
3. Import a JEX notebook. Verify that the loading indicator is visible, but doesn't spin or move.