Animated.loop branches on the raw `useNativeDriver` flag, not on driver
availability. On react-native-web that sends the loop down `_startNativeLoop`,
which starts one JS-driven timing pass whose `iterations` the JS driver ignores,
so the spinner ramps 0 -> 1 once and freezes. Verified against the real
react-native-web Animated: 3.5s of frames yields zero restarts with the flag on,
3+ with it off.
The same components also lost their ring gap on web: an inline `borderColor`
after a StyleSheet `borderTopColor` is emitted as four inline longhands that
outrank the class, rendering a solid ring instead of an arc.
Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb
Jinwoo-H
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