chore: relax COOP on preview deploys

[kernelwhisperer]

Re-created because it was reverted, original PR: #7825

Summary

• Sets Cross-Origin-Opener-Policy to unsafe-none for non-production Vercel deployments.
• Keeps production on same-origin-allow-popups.

Why

Google Tag Assistant preview can lose its cross-origin opener/debug connection when the preview page sends a stricter COOP header. This branch gives us an isolated Vercel preview URL to verify whether relaxing COOP fixes the Tag Assistant connection without changing the original captcha analytics PR branch.

Preview

• https://swap-dev-git-agent-gtm-tag-assistant-coop-preview-cowswap-dev.vercel.app/?gtm_debug=x
• Verified response header: cross-origin-opener-policy: unsafe-none

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
cowfi	Ready	Preview	Jul 20, 2026 5:28pm
explorer-dev	Ready	Preview	Jul 20, 2026 5:28pm
sdk-tools	Ready	Preview	Jul 20, 2026 5:28pm
storybook	Ready	Preview	Jul 20, 2026 5:28pm
swap-dev	Ready	Preview	Jul 20, 2026 5:28pm
widget-configurator	Ready	Preview	Jul 20, 2026 5:28pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
cosmos	Ignored		Jul 20, 2026 5:28pm

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: eb37b002-3095-4687-8d7e-6e0b586ab099

📥 Commits

Reviewing files that changed from the base of the PR and between 58cee38 and 2115036.

📒 Files selected for processing (1)

• apps/cowswap-frontend/vercel.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/gtm-tag-assistant

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