Revert "ci: Skip flaky playwright test for now"

[juliusknorr]

Reverts #850

needs work

[hweihwang]

Close as current seems fine. cc @juliusknorr !

[juliusknorr]

No, we skipped a test that was failing and still is. This PR is the reminder to revert the skip and fix it, so this still needs to be done. If the test is not relevant we should drop it

[KhyFee]

Re-enabling whiteboard content persists after reload and reopen is the right long-term move — skipping it forever hides regressions.

Before merging, I’d want evidence the original flake is actually gone:

1. Link/CI showing this spec green across multiple retries (or a few consecutive CI runs), not just a single pass.
2. If the flake was timing/reload related, consider a small harden in the same PR: wait for a stable board ready signal after reopen (network idle / specific locator) instead of only removing test.skip.
3. Optional: tag it @flaky / quarantine with retries for one release if you’re still unsure, then fully un-skip.

As written this is a 1-line revert — fine if CI already proves stability; risky if the skip was recent and unfixed.