Christian Byrne b22c646910 test: E2E coverage for toasts, error overlay, selection toolbox, linear mode (#9555) ...

## Summary

Add 26 E2E tests across 5 spec files covering high-impact,
frequently-used UI flows: toast notifications, error overlay navigation,
selection toolbox actions, linear mode layout, and selection rectangle
multi-select.

## Tests

| Spec file | Tests | Coverage |
|---|---|---|
| `toastNotifications.spec.ts` | 5 | Toast lifecycle, dismiss, severity
levels |
| `errorOverlaySeeErrors.spec.ts` | 6 | Error overlay → errors panel
navigation flow |
| `selectionToolboxActions.spec.ts` | 4 | Delete, info,
convert-to-subgraph, multi-delete |
| `linearMode.spec.ts` | 5 | Linear layout toggle, widget rendering,
persistence |
| `selectionRectangle.spec.ts` | 6 | Vue node multi-selection via
rectangle drag |

## Review Focus

- Selection toolbox tests use `force: true` clicks due to CSS transform
positioning — is this acceptable or should we find a more robust
approach?
- 2 additional toolbox tests (bypass, refresh) were split to draft PR
#9768 due to flaky CI visibility issues with
`useSelectionToolboxPosition`.

## Stack

Depends on #9554 for FeatureFlagHelper/QueueHelper infrastructure.

- #9554: Test infrastructure helpers
- **→ This PR**: Toasts, error overlay, selection toolbox, linear mode,
selection rectangle
- #9556: Node search, bottom panel, focus mode, job history, side panel
- #9557: Errors tab, node headers, queue notifications, settings sidebar
- #9558: Minimap, widget copy, floating menus, node library essentials

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Co-authored-by: GitHub Action <action@github.com>

2026-03-16 23:37:40 -07:00

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