`useCommunityRealtime` was already patching the React-Query cache
on community_posts UPDATE events — likesCount, dislikesCount, userLike
all reached the component as props on re-render. But PostCard was
seeding `localLike` / `localCount` once via useState initial values
and never re-reading the props after mount, so a like from another
account showed up as a notification but the heart counter stayed
stale until pull-to-refresh.
Added a useEffect that mirrors `post.likesCount` / `post.userLike`
back into local state, guarded by `isLiking` so an in-flight
optimistic update isn't clobbered by a concurrent realtime patch
of the same row.
Handles unlike (decrement) on the same path, plus off-screen posts
which get the patched cache value on remount and feed-list cards
that refresh in place without scroll.
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