Show error dialog when scene uses non-optimized DracoMesh Compression

## Description

When a scene uses DracoMesh Compression that is not optimized, it will fail to load properly on mobile. Currently this fails silently or shows unclear errors.

We need to design and implement a user-facing error dialog that clearly communicates this issue to the user when a scene has non-optimized DracoMesh Compression.

## Expected Behavior

- Detect when a scene is using non-optimized DracoMesh Compression
- Show a clear, user-friendly error dialog explaining the issue
- The dialog should inform the user that only the optimized version will work

## Context

This will improve the user experience when encountering scenes with compression issues, making it clear why content isn't loading rather than failing silently.

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*Requested by Mateo via Slack*