fix(site): remove erroneous "install Cursor" notification for Cursor Desktop

[AloofBuddha]

Summary

This change removes the erroneous “Install Cursor” notification in the desktop environment when Cursor is already installed. The issue is the timeout of 500ms was simply too short for Cursor Desktop to respond in time, so I increased it to 1500ms. This seems to consistently work, but it could easily be increased to 2000ms to be safe.

Issue

Fixes #20289

Testing

• Verified that when Cursor is installed, the notification no longer appears

QA

Before

Screen.Recording.2025-11-22.155304.mp4

After

Screen.Recording.2025-11-22.155748.mp4

[github-actions]

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[AloofBuddha]

I have read the CLA Document and I hereby sign the CLA

[ethanndickson]

Approving since I've seen this issue reported a few times now, and it makes sense that 500ms is just too fast for a lot of IDEs.

Thanks for the PR! This will be available in the next mainline release (next week!)