The browser tests added in #8143 were failing on main because they were
written against stale `ComfyPage` APIs that were refactored in #8510
(merged Feb 3, before #8143 merged Feb 18).
### Changes
- `comfyPage.dragAndDropFile` → `comfyPage.dragDrop.dragAndDropFile`
- `comfyPage.setSetting` → `comfyPage.settings.setSetting`
- `comfyPage.loadWorkflow` → `comfyPage.workflow.loadWorkflow`
- `comfyPage.getNodeRefsByType` → `comfyPage.nodeOps.getNodeRefsByType`
- Fix `comfyPage` type parameter to use `ComfyPage` import
- Remove `test.fixme` since root cause was API mismatch, not test logic
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8995-fix-update-imagePreview-browser-tests-to-use-current-fixture-APIs-30d6d73d365081219c1eda4ea7251160)
by [Unito](https://www.unito.io)
3e4d273832