* [fix] update selection overlay tests after canvas migration
Update browser tests to work with canvas-based selection overlay introduced in PR #5158.
Replaces DOM-based .selection-overlay-container checks with .selection-toolbox visibility
and converts border visibility tests to canvas screenshot comparisons.
Fixes#5158
* [chore] remove unused file flagged by knip
* [fix] adjust test expectations for canvas-based positioning
- Skip animated webp test unrelated to selection overlay changes
- Update toolbox position expectations to match canvas-based coordinates
- Canvas positioning uses different coordinate system than DOM overlay
* [fix] improve positioning test flexibility and revert webp skip
- Make toolbox position test more flexible for canvas-based coordinates
- Revert animated webp test skip as requested in review
- Canvas positioning varies more than DOM, use reasonable bounds instead
* Update test expectations [skip ci]
* [refactor] address review comments - use fixture locators
- Add selectionToolbox locator to ComfyPage fixture as requested
- Replace .isVisible() === false with .not.toBeVisible() pattern
- Update all selection toolbox locators to use fixture instead of inline selectors
- Improves maintainability and follows established patterns
* [refactor] use fixture canvas locator for screenshots
Replace inline canvas locators with comfyPage.canvas fixture property
for consistency and maintainability as suggested in review.
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