Auth: Display authorization denied message to the user access is denied

[gavande1]

…ation process when access is denied.

Related issues

• Fixes STU-1103

Proposed Changes

• Display specific error message to the user when authorization is explicitly denied by them while login into Studio.

Testing Instructions

• Switch to this branch
• Run npm start
• If you’re already logged into WordPress.com, log out
• Click Log In
• When the OAuth page opens up, click on Deny
• You’ll be taken back to the Studio with a message saying you denied the request

Before	After

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[github-actions]

📊 Performance Test Results

Comparing 191af6d vs trunk

site-editor

Metric	trunk	191af6d	Diff	Change
load	13281.00 ms	11834.00 ms	-1447.00 ms	🟢 -10.9%

site-startup

Metric	trunk	191af6d	Diff	Change
siteCreation	19444.00 ms	21328.00 ms	+1884.00 ms	🔴 9.7%
siteStartup	8014.00 ms	8029.00 ms	+15.00 ms	🔴 0.2%

---

Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change

[ivan-ottinger]

Nice improvement! The code looks good. I have left a copy suggestion.

[epeicher]

Thanks for improving this @gavande1! I have tested it, and I can see now the new message, which sounds less scary. I agree with the suggestion from @ivan-ottinger, but overall this LGTM!

[katinthehatsite]

Looks good to me 👍 I left some suggestions for the copy.