## Summary - centre the split-desktop Plan/Decisions control and render it as a joined segmented group - add browser coverage for geometry, visual state, accessible count, and view switching - ignore workspace-local .codex files and remove the requested Superpowers plan and spec

## Verification - bun test - bun run build - bun run types - bun run ci - focused browser test added, but local e2e bootstrap could not start Playwright because the disposable PostgreSQL services repeatedly closed connections during migration/health startup