Definition pages timing out or failing to load

**Description**

Definition pages are consistently slow to load and frequently time out entirely, making the UI unreliable for review workflows.

**Observed Behaviour**

- Many times definition pages never finish loading — they hang indefinitely with no content rendered and no visible error
- Few are extremely slow, taking an unusually long time before showing any content
- When attempting to preview a file where CD detected license occurrences, the page results in a blank screen (likely a downstream timeout)

**Examples of pages that fail to load entirely**

https://clearlydefined.io/definitions/npm/npmjs/-/aws-sdk/2.1067.0

Start by reproducing the failure with the linked aws-sdk definition page and the file-preview scenario, then trace the request path that serves definition pages. Done means affected pages render reliably without indefinite loading or timeouts, and the license-occurrence preview no longer shows a blank screen.

Written by the indexing model from the issue text.