[codex] Fix preview automation edge cases (#3561)

[aaditagrawal]

What Changed

Why

UI Changes

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

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Run ID: 3824f4a9-6c62-40e0-aa51-dc65584a5ec8

📥 Commits

Reviewing files that changed from the base of the PR and between 790074e and 1692a13.

📒 Files selected for processing (7)

• apps/desktop/src/preview/Manager.test.ts
• apps/desktop/src/preview/Manager.ts
• apps/desktop/src/preview/PreviewKeyboard.test.ts
• apps/desktop/src/preview/PreviewKeyboard.ts
• apps/web/src/components/preview/PreviewAutomationHosts.tsx
• apps/web/src/components/preview/previewAutomationOpenReadiness.test.ts
• apps/web/src/components/preview/previewAutomationOpenReadiness.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sync/upstream-20260626-preview-edge-cases

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[aaditagrawal]

• fix(grok): Harden ACP resume with replay-idle load readiness (#3156) #129
• [codex] Fix preview automation edge cases (#3561) #128 👈 (View in Graphite)
• Route preview automation through live owner streams (#3548) #127
• Fix Electron dev and packaged renderer startup (#3557) #126
• Restore right panel inset when maximized (#3555) #125
• [codex] Upgrade Legend List chat scrolling (#3545) #124
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[aaditagrawal]

Merge activity

• Jun 26, 3:03 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 26, 3:11 PM UTC: Graphite rebased this pull request as part of a merge.
• Jun 26, 3:11 PM UTC: @aaditagrawal merged this pull request with Graphite.