Fix CI: exclude demo/visual specs, fix oil-card→oil-chip selectors

- Grep pattern now matches full filenames (demo-walkthrough, visual-check)
- Updated all test files to use .oil-chip (new OilReference class name)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/test.yml

@@ -42,7 +42,7 @@ jobs:
 
           # Run cypress from frontend dir
           cd frontend
-          SPECS=$(ls cypress/e2e/*.cy.js | grep -v demo | grep -v visual | grep -v check | tr '\n' ',')
+          SPECS=$(ls cypress/e2e/*.cy.js | grep -v demo-walkthrough | grep -v visual-check | grep -v check-price | tr '\n' ',')
           npx cypress run --spec "$SPECS" --config video=false
           EXIT_CODE=$?