Fix workflow: use npm install (no lockfile present)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: b3008

.github/workflows/deploy-storybook.yml

@@ -25,9 +25,8 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: 20
-          cache: yarn
 
-      - run: yarn install --frozen-lockfile
+      - run: npm install
 
       - run: npm run build-storybook