[Crash Report] Crash when using eyedropper on Friefox

**Describe the Crash**
Explain clearly what you were doing when the crash occurred.

**Steps To Reproduce**
1. Open new editor window
2. Click on "eyedropper" icon
3. Click anywhere in the drawing canvas -> crash

Reproducible on https://dev.graphite.art too.

**Additional Details**
Reproducible in "private window" and in a new Firefox profile with no add-ons.
Couldn't reproduce it in LibreWolf (Firefox derived browser) and Chromium.

**Browser and OS**
Firefox 153.0.1, Windows 11

**Stack Trace**
Copied from the crash dialog in the Graphite editor:

```
panicked at node-graph/libraries/wgpu-executor/src/texture_conversion.rs:244:35:
Failed to download texture data: BufferAsyncError

G_/<@https://editor.graphite.art/assets/index-m1lViLdB.js:1143:893
Av/n/<@https://editor.graphite.art/assets/index-m1lViLdB.js:1143:8163
l@https://editor.graphite.art/assets/index-m1lViLdB.js:1143:8593
handleFrontendMessage@https://editor.graphite.art/assets/index-m1lViLdB.js:1143:8773
Zy/

Reproduce the crash by opening a new editor window in Firefox, selecting the eyedropper, and clicking the drawing canvas. Then inspect node-graph/libraries/wgpu-executor/src/texture_conversion.rs around line 244 and trace the texture download path from the stack trace. Done means the eyedropper no longer crashes Firefox and the reported reproduction steps complete successfully.

Written by the indexing model from the issue text.