ci: LibreOffice builds formula objects, and node strips the TS import

libreoffice-writer alone has no Math component, so Writer dropped every formula
it imported — Word's own OMML included — and the fuzz leg saw the loss.
node 20 cannot import tests/schemaValidate.ts, which the monkey run does; 24
strips the types. node 20 is end of life anyway.

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
             || { echo "a test reads the gitignored parity corpus"; exit 1; }
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 24
           cache: npm
       - run: npm ci
       - run: npm run check
@@ -38,10 +38,11 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 24
           cache: npm
-      # poppler-utils rasterizes the PDFs the render-consistency leg compares.
-      - run: sudo apt-get update && sudo apt-get install -y --no-install-recommends libreoffice-writer fonts-liberation poppler-utils
+      # libreoffice-math builds the formula objects both importers read back (without it
+      # Writer drops every formula); poppler-utils rasterizes the render-consistency PDFs.
+      - run: sudo apt-get update && sudo apt-get install -y --no-install-recommends libreoffice-writer libreoffice-math fonts-liberation poppler-utils
       - run: npm ci
       - run: npm run test:lo
       - run: npx playwright-core install --with-deps chromium
@@ -65,7 +66,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 24
           cache: npm
       - run: npm ci
       - run: npx playwright-core install --with-deps ${{ matrix.browser }}

.github/workflows/deploy.yml

@@ -27,7 +27,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 24
           cache: npm
       - run: npm ci
       - run: npm run build