bug: Embedded app preview fails to load / renders blank screen on StackBlitz #4277

Description

When running the DOM Project preview in StackBlitz, the embedded preview pane (right panel) renders a blank white screen instead of displaying the application output.

Steps to Reproduce

1. Open the DOM Project repository/playground on StackBlitz (dom-project-chaiaurcode.stackblitz.io).
2. Wait for the application server to compile (Compiling application & starting dev server...).
3. Observe the preview pane on the right-hand side.

Expected Behavior

The app user interface should render correctly inside the preview panel after the dev server starts.

Actual Behavior

The preview panel remains completely blank (white screen).

Environment Details

• Browser: Safari (macOS)
• Platform: StackBlitz (stackblitz.com)
• URL: dom-project-chaiaurcode.stackblitz.io