Regenerate theme stuck at "Generating theme..." and never completes

[wusolarday]

Steps to reproduce

Steps:

1. Open Material UI Sync
2. Click Regenerate theme
3. The progress bar shows "Generating theme..." and gets stuck indefinitely

Current behavior

After clicking Regenerate theme, the progress bar stays at "Generating theme..." and never finishes. I have to manually close the window.

Expected behavior

After clicking Regenerate theme, the theme generation should finish within a reasonable time and show a completed state so I can copy or export it.

Context

I’m trying to regenerate a Material UI theme to sync with my design file, but the process never finishes, making it unusable.

Your environment

Software	Version
Design file version	v6.1.0
Design tool	Figma
OS	macOS 15.5（24F74）
etc.

Search keywords: regenerate theme, generating theme stuck, material ui sync

[zannager]

@wusolarday see related issue in #435