Infrastructure Composer - Unable to preload images for the canvas

## Problem
When Infrastructure Composer is open, the message "Unable to preload images for the canvas" and no image is shown.

I have tried in other project workspaces with no success.

## Steps to reproduce the issue

## Expected behavior

View template resources in the canvas

## System details (run `AWS: About` and/or `Amazon Q: About`)

- OS: Windows 11
- Visual Studio Code version:
Version: 1.103.2 (system setup)
Commit: 6f17636121051a53c88d3e605c491d22af2ba755
Date: 2025-08-20T16:45:34.255Z
Electron: 37.2.3
ElectronBuildId: 12035395
Chromium: 138.0.7204.100
Node.js: 22.17.0
V8: 13.8.500258-electron.0
OS: Windows_NT x64 10.0.26100
- AWS Toolkit version: 3.74.0
- Amazon Q version:

Start by opening Application Builder and choosing “Open With Infrastructure Composer,” as described in the issue, then investigate the “Unable to preload images for the canvas” error. Done means template resources are visible in the canvas; the issue does not identify a file, test, or specific change to make.

Written by the indexing model from the issue text.