fix for issue #3817 -- add visual regression test for sketchfab result

[sTarunRaaj]

Fixes

Fixes #3817 by @dhruvkb

Description

Adds a visual regression test for a known Sketchfab 3D model result page: /image/da5cb478-c093-4d62-b721-cda18797e3fb.

This test ensures that the Sketchfab embedded viewer renders correctly on the single result page across different breakpoints and language directions (LTR/RTL). It helps catch future layout or rendering regressions that could affect the 3D viewer.

The test was added to the existing pages-single-result.spec.ts file using Playwright's snapshot comparison.

Testing Instructions

1. Run the test: pnpm test:e2e --grep "Sketchfab"
2. Confirm that a snapshot is generated in the appropriate __snapshots__ directory.
3. Verify that the iframe loads and the page renders as expected before the screenshot is taken.
4. Optionally modify layout/CSS and re-run to confirm visual diff detection.

Checklist

• Descriptive PR title
• Targets main branch
• Commit messages follow best practices
• Code follows project style
• Test added for the change
• Documentation updated (not applicable)
• Project runs locally without errors
• DAG or API docs generated (not applicable)