fix: wire citation handler to v2 importer

[mattConnHarbour]

The v2 importer was missing a handler for sd:citation elements. The field preprocessor converts CITATION field codes to sd:citation XML, and the v3 translator exists, but nothing bridged them to ProseMirror nodes.

This follows the same pattern as bibliographyImporter.js.

Fixes SD-3120

[linear]

SD-3120

[github-actions]

Status: PASS

The diff is purely wiring — citationImporter.js is a 7-line shim that registers a handler via generateV2HandlerEntity, and docxImporter.js just adds the import and the entry to the handler list. Neither file references any OOXML elements or attributes directly, so there's nothing in this diff to violate the spec.

For context, the underlying citation-translator.js (not in this diff) handles sd:citation (SuperDoc custom namespace, not OOXML) on encode and decodes back to a standard field structure: w:r runs containing w:rPr and w:fldChar with w:fldCharType values of begin, separate, and end — all valid OOXML constructs (w:fldChar).

[codecov-commenter]

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✅ All modified and coverable lines are covered by tests.

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[github-actions]

📦 Preview published: superdoc@1.32.0-pr.3259.1778622890

npm install superdoc@pr-3259