Stabilize playground collab WebKit E2E waits

[screenfluent]

Fixes #8112.

This replaces a couple of short fixed sleeps in packages/lexical-playground/tests/e2e/Collaboration.spec.mjs with explicit waits:

• Wait for the Undo button to be enabled before clicking (removes sleep(50)).
• Wait for both editors to converge after the first delete before performing the second cross-frame delete (removes sleep(50)).

No behavior assertions changed; this only makes the existing test steps more deterministic.

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Project	Deployment	Actions	Updated (UTC)
lexical	Ready	Preview, Comment	Feb 3, 2026 9:01pm
lexical-playground	Ready	Preview, Comment	Feb 3, 2026 9:01pm

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[etrepum]

This PR can't be considered without acceptance of the CLA, and it seems to be failing the prettier ci-check. pnpm run prettier:fix should address that issue.

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Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!