Add changelog entry for builds preview button

Author: yomna-shousha

src/assets/images/changelog/workers/builds-preview-button.png

@@ -0,0 +1,17 @@
+---
+title: Preview URLs now visible in build details page
+description: You can now access Preview URLs directly from the build details page
+products:
+  - workers
+date: 2025-10-30
+---
+
+You can now access [preview URLs](/workers/configuration/previews/) directly from the build details page. No more hunting through build logs or pull request comments to find your preview link.
+
+![preview button](src/assets/images/changelog/workers/builds-preview-button.png)
+
+
+**What's new**
+* A **Preview** button now appears in the top-right corner of the build details page for successful builds
+* Click it to instantly open your per-branch preview URL and test changes before merging
+* Matches the same experience you're familiar with from Pages