fix(web): render Gmail logo in worker flow

[federicodeponte]

Closes #2026.

Summary

• adds DOM regression coverage for WorkerFlow connection chips
• locks that Gmail renders through the shared BrandLogo sprite (#brand-gmail)
• locks that unknown/unregistered connection slugs still render as text

Note: current main already contains the component-side ToolChip helper that renders known brand logos; this PR preserves that behavior with focused regression coverage.

Verification

• npm test -- --project dom tests/worker-flow-brand-logo.dom.test.tsx PASS
• npm run lint PASS with existing warnings only
• npx tsc --noEmit FAILS on existing tests/collection-view.dom.test.tsx Element typing errors, unrelated to this change
• Local browser proof passed: #brand-gmail present, visible lowercase gmail text absent
• Refreshed proof gist: https://gist.github.com/federicodeponte/29260fea7db1ac29f132b993dee3fe26