Stabilize mobile Settings Center E2E readiness

[bifrost0x]

Summary

• wait for the Preferences panel to be activated by the Settings Center navigation before measuring mobile layout
• avoid treating unstyled, pre-initialization markup as the rendered page
• keep production UI and layout behavior unchanged

Root cause

The failed post-merge run measured document width while the Settings Center CSS and JavaScript were still loading. Visibility checks could pass before the hidden CSS rule was available, so the test observed the intrinsic width of inactive administration markup.

Verification

• affected mobile test repeated 10 times: 10 passed
• affected test with a simulated 500 ms stylesheet delay: passed
• complete account-menu.spec.js: 3 passed

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-08-31T11:06:41.974121Z	89418b6	PR opened

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