fix: Correct error key reference in project upload error handling

[YuriNachos]

Fixes #11293

Summary

• Fixed incorrect key reference in project upload error handler
• Changed from 'message' to 'detail' to match API response structure

Test plan

• Verified build succeeds without TypeScript errors
• Manually tested uploading invalid JSON file
• Confirmed error message displays correctly

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📥 Commits

Reviewing files that changed from the base of the PR and between 2f27401 and 5881185.

📒 Files selected for processing (1)

• src/frontend/src/components/core/folderSidebarComponent/components/sideBarFolderButtons/index.tsx

✨ Finishing touches

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• Create PR with unit tests
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