ci: fix npm optional dependency issue in typescript tests

Use --install-strategy=nested to avoid npm hoisting issues with
platform-specific optional dependencies (rollup required by vitest).

See: npm/cli#4828

Author: dubadub

.github/workflows/typescript.yml

@@ -13,7 +13,9 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: 22
-      - run: npm ci
+      # Use nested install strategy to avoid npm hoisting issues with
+      # platform-specific optional dependencies (rollup/vitest)
+      - run: npm ci --install-strategy=nested
       - name: test pkg
         run: npm test
         working-directory: ./typescript