Add a script to easily compare failed snapshot tests

[abey79]

Related

• Related to Introduce kittest for automated UI testing and git-lfs for UI snapshot handling #8182

What

Introduce a new helper to manage and visualise failed kittest snapshot tests using Rerun.

pixi run snapshots --help

# view all failed snapshot
pixi run snapshots

# remove all failed snapshot temp files
pixi run snapshots --clean

# only view (or clean) snapshot for that crate
pixi run snapshots -p re_time_panel

Clipboard-20250207-082155-418.mp4

[github-actions]

Web viewer built successfully. If applicable, you should also test it:

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Result	Commit	Link	Manifest
✅	79bf5ae	https://rerun.io/viewer/pr/8346	+nightly +main

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[github-actions]

Latest documentation preview deployed successfully.

Result	Commit	Link
✅	79bf5ae	https://landing-qhsbo09h4-rerun.vercel.app/docs

^{Note: This comment is updated whenever you push a commit.}

[teh-cmc]

Works as advertised 👍