Update

The same issue occurred again today. Unlike the last time when it resolved itself spontaneously after a while, this time the problem persisted.

I tested on both Safari and Google Chrome, and Databricks worked perfectly on them. This confirmed the issue was isolated to the Arc browser.

Solution

With some help from Gemini, I found the fix. Disabling "Use graphics acceleration when available" in the Arc settings (arc://settings/system) immediately solved the infinite loading issue.

Everything is working fine now!