Fails to open temporary image file in Windows 11

## Describe the bug
When attempting to load a PNG image for compression, the plugin returns the following error:

`Failed to compress PNG file using PNGQUANT. Exit code: 2. Error: error: cannot open C:\Users\XXXX\AppData\Local\DevToys-preview\Temp\tmpohwxq1.png for reading`

There is no `DevToys-preview` folder in `...\AppData\Local`. Creating such a folder manually does not solve the issue.

## To Reproduce
Open the plugin in DevToys-preview. Drag & drop, copy & paste, browse for a PNG file, or browse for a folder containing a PNG file.

## Expected behavior
The plugin should compress the PNG file.

## Desktop
- OS: Windows 11 Home
- DevToys v2.0-preview.1
- PNG Compressor 1.0.0-pre.0

Start by reproducing the failure in the DevToys-preview PNG Compressor with the drag-and-drop, paste, file, and folder inputs described. Trace the temporary PNG creation and PNGQUANT invocation, then verify that each input compresses successfully on Windows 11 without the missing-file error.

Written by the indexing model from the issue text.