sell=buy this time its comingggg

[anxolin]

Summary

🚨 do not merge this branch. Highly experimental, just to test backend staging is working. This PR revives #5075 one

🧪 Experiment to allow to select the same token for the sell and buy when we use hooks.
This allows to use CoW Swap as a gas network.

SWAP (and all other swap flows) remains the same.

However hooks flow, allow to select the same sell/buy token

WIP: quotes are broken, not only in the backend, also in the frontend.

Blocked

The backend sends still a 40X when the sell token and buy token matches

EDIT: 05/12/2025 Not blocked backend any more!

[vercel]

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Project	Deployment	Preview	Updated (UTC)
cowfi	Error		Dec 5, 2025 7:15pm
explorer-dev	Ready	Preview	Dec 5, 2025 7:15pm
sdk-tools	Error		Dec 5, 2025 7:15pm
swap-dev	Ready	Preview	Dec 5, 2025 7:15pm
widget-configurator	Error		Dec 5, 2025 7:15pm

1 Skipped Deployment

Project	Deployment	Preview	Updated (UTC)
cosmos	Ignored		Dec 5, 2025 7:15pm

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/allow-same-tokens-for-hooks

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