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fix(web): a hydrating hole holding a raw string re-claims its region (#4374) (#4382)

* fix(web): a hydrating hole holding a raw string re-claims its region (#4374)

A `<Loading>` with a bare-string fallback, the sole content of a
markerless parent, leaves the hole's `current` as that string after the
root pass. `reclaimRegion` bailed for non-node currents, so after the
streamed `$df` swap the content pass reconciled against the stale string:
the server's text stayed beside a fresh copy (a nested Errored's fallback
rendered twice), or text after an element moved or was replaced instead
of adopted. While hydrating, a disconnected-or-primitive `current` now
re-claims the region, as it does when the nodes it tracks are gone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

* fix(web): a falsy primitive fallback (0) re-claims its region too (#4374)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

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Co-authored-by: Claude <noreply@anthropic.com>

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