Docker hosts with 'degraded' status were incorrectly appearing dimmed
(opacity-60) in the summary table, making them visually identical to
offline hosts. This was confusing because degraded hosts are still
actively reporting - they just have unhealthy containers or >35% of
containers not running.
The isHostOnline function now treats 'degraded' as an online status,
so these rows maintain full opacity. The status badge already provides
visual indication of the degraded state.
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