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Refactor error/warning count tracking to avoid pre-allocating an ID for Fibers that aren't yet mounted. Instead, we store a temporary reference to the Fiber itself and later check to see if it successfully mounted before merging pending error/warning counts. This avoids a problematic edge case where a force-remounted Fiber (from Fast Refresh) caused us to untrack a Fiber that was still mounted, resulting in a DevTools error if that Fiber was inspected in the Components tab.