hide unread state for selected chat list item

In split view the chat list stays mounted alongside the open convo. The
selected item's unread indicator could flicker (read -> unread -> read) as
stale listConvos refetches raced the eventually-consistent read receipt.
Gate hasUnread on !selected so the open chat never shows unread affordances.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/screens/Messages/components/ChatListItem.tsx

@@ -282,6 +282,7 @@ function BaseChatItem({
   const playHaptic = useHaptics()
   const queryClient = useQueryClient()
   const hasUnread =
+    !selected &&
     !isDeletedAccount &&
     (convo.view.unreadCount > 0 ||
       (convo.kind === 'group' &&