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save() now wraps each chunk fetch in try/catch — a thrown network error marks all files in that chunk as errored. Also handles HTTP 200 responses with a non-empty errors array (partial success): only the named filenames are marked as errored rather than all files in the chunk. Navigation is suppressed whenever any file fails. Tests added: - network error marks all chunk files as errored, no navigation - HTTP 200 with errors array marks only affected files Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>