References for Client Components need to be aggregated to the page entry level, and emitted as files in the correct directory for the SSR server to read from. For normal routes (e.g. `app/foo/bar/page`), we can go through and collect all entries (layout, loading, error, ...) from the current and parent segments, to aggregate all necessary client references.
However, for routes with special conventions like `app/(group)/@named/foo/bar/page`, it needs to be normalized (remove the named slot and group segments) so it can be grouped together with `app/(group)/@named2/foo/bar/loading`.
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