fix: DOCX carries the citation style and an all-off table look

The b:Sources part is also the citation style's only carrier, so a document
whose bibliography index sets a non-default style writes it even with no
source cited. The importer keeps a declared all-off w:tblLook ('') instead
of dropping it back to the default look.

src/lib/export/docx.ts

@@ -1258,7 +1258,9 @@ function bibSourceXml(s: BibSource): string {
 // part of their own, which needs its properties part, two relationships and a content
 // type — none of which the package knows about, so all four are minted here.
 function applyBibliographyDocx(bytes: Uint8Array, sources: BibSource[], cite: CitationStyle): Uint8Array {
-  if (!sources.length) return bytes;
+  // The part is also the citation style's only carrier (its StyleName attribute), so a
+  // non-default style still writes it with no sources in it.
+  if (!sources.length && cite === 'key') return bytes;
   const files = unzipSync(bytes);
   const relsPath = 'word/_rels/document.xml.rels';
   const rels = files[relsPath] ? strFromU8(files[relsPath]) : '';

src/lib/import/docx.ts

@@ -2359,8 +2359,9 @@ function buildTable(tbl: Element, ctx: Ctx): Node | null {
   if (hdr && onOff(hdr)) attrs.repeatHeader = true;
   if (named) {
     attrs.tableStyle = named;
+    // '' is a declared all-off look — dropping it would revert to the default look.
     const look = docxTableLook(fc(tbl, 'tblPr'));
-    if (look) attrs.tableLook = look;
+    if (look != null) attrs.tableLook = look;
   }
   return Object.keys(attrs).length ? { type: 'table', attrs, content: rows } : { type: 'table', content: rows };
 }