docs: changelog for new wrangler error screen

Author: edmundhung

src/assets/images/workers/changelog/error-screen-dark.png

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+---
+title: Better error screen coming to Wrangler
+description: Wrangler's error screen now features light and dark themes, more reliable source map resolution, and better error cause display.
+products:
+  - workers
+date: 2025-08-19
+---
+
+Wrangler's error screen has received several improvements to enhance your debugging experience. The error screen now features a refreshed design with support for both light and dark themes, improved source map resolution logic that handles missing source files more reliably, and better error cause display.
+
+![Light theme error screen](../../../assets/images/workers/changelog/error-screen-light.png)
+![Dark theme error screen](../../../assets/images/workers/changelog/error-screen-dark.png)
+
+These improvements are available now in the latest version of Wrangler during local development.
+