fix(approve): add loading state when approve request is sent

[shoom3301]

Summary

Fixes https://www.notion.so/cownation/Add-loading-state-to-the-approval-button-inside-the-Account-modal-2878da5f04ca80619de9f9be0666d44b?source=copy_link

To Test

See https://www.notion.so/cownation/Add-loading-state-to-the-approval-button-inside-the-Account-modal-2878da5f04ca80619de9f9be0666d44b?source=copy_link

[vercel]

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Project	Deployment	Preview	Updated (UTC)
cowfi	Ready	Preview	Oct 23, 2025 11:39am
explorer-dev	Ready	Preview	Oct 23, 2025 11:39am
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2 Skipped Deployments

Project	Deployment	Preview	Updated (UTC)
cosmos	Ignored		Oct 23, 2025 11:39am
sdk-tools	Ignored	Preview	Oct 23, 2025 11:39am

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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 fix/partial-approve-loading-state

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[elena-zh]

Thank you!