[Workers] changelog for new wrangler error screen

src/content/changelog/workers/2025-08-19-improved-wrangler-error-screen.mdx

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+---
+title: Easier debugging in Workers with improved Wrangler error screen
+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.
+
+| Before | After (Light) | After (Dark) |
+|--------|---------------|--------------|
+| ![Old error screen](../../../assets/images/workers/changelog/old-error-screen.png) | ![New light theme error screen](../../../assets/images/workers/changelog/new-error-screen-light.png) | ![New dark theme error screen](../../../assets/images/workers/changelog/new-error-screen-dark.png) |
+
+Try it out now with `npx wrangler@latest dev` in your Workers project.