ci: trigger visual diff on tests/visual changes

Baseline-only PRs should run Screenshot diff now that home.png is committed.

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/visual-diff.yml

@@ -22,6 +22,9 @@ on:
       - 'styles/**'
       - 'tailwind.config.js'
       - 'postcss.config.js'
+      # Baseline/spec-only PRs (e.g. seed-visual-baselines-on-linux) must
+      # exercise Screenshot diff now that tests/visual/__screenshots__/ is committed.
+      - 'tests/visual/**'
 
 concurrency:
   group: visual-diff-${{ github.event.pull_request.number }}