test(playground): cover remaining layout persistence cases

[devsi-bruno]

Jira: BRU-4083

Summary

• Adds the missing playground layout persistence e2e cases for BRU-4083: independent height/width, first-visit defaults, corrupt and out-of-range stored height, default bottom dock on a fresh Try it, and sessionStorage writes.

[changeset-bot]

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Latest commit: 82ddfdf

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