ci: auto-accept Chromatic UI test changes

Matches the pattern used in polislike-partykit-reaction-canvas.
We don't review visual diffs in Chromatic, so auto-accepting keeps
the CI green without manual intervention.

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

Author: patcon

.github/workflows/storybook.yaml

@@ -23,3 +23,4 @@ jobs:
         with:
           # ⚠️ Make sure to configure a `CHROMATIC_PROJECT_TOKEN` repository secret
           projectToken: ${{ secrets.CHROMATIC_PROJECT_TOKEN }}
+          autoAcceptChanges: true