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## Summary Add Playwright e2e tests for the node replacement feature (swap nodes UI in the errors tab). ## Changes - **What**: 6 e2e test cases across two describe blocks covering single and multi-type node replacement flows. Tests verify swap nodes group visibility, in-place replacement, widget value preservation, Replace All across multiple types, output connection preservation, and success toast display. Includes typed mock data for `/api/node_replacements` and two workflow fixture files with fake missing node types mapped to real core nodes. ## Review Focus - Mock setup pattern in `setupNodeReplacement` — enables feature flag via `page.evaluate` and routes the API endpoint - Workflow fixture design — uses fake node types (E2E_OldSampler, E2E_OldUpscaler) that map to real registered types (KSampler, ImageScaleBy) - Assertion coverage for link preservation after replacement ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-11242-test-add-e2e-tests-for-node-replacement-flows-3426d73d3650811e87d7f0d96fd66433) by [Unito](https://www.unito.io) --------- Co-authored-by: Connor Byrne <c.byrne@comfy.org>
