INT-06: Migrated playback_websocket_handler.go from deprecated gorilla/websocket to coder/websocket v1.8.14. Uses context-based reads/writes and websocket.Accept instead of Upgrader.
- CI: workflows updates (cd, ci), remove playwright.yml - E2E: global-setup, auth/playlists/profile specs - Remove playwright-report and test-results artifacts from tracking - Backend: auth, handlers, services, workers, migrations - Frontend: components, features, vite config - Add e2e-results.json to gitignore - Docs: REMEDIATION_PROGRESS, audit archive - Rust: chat-server, stream-server updates
