Android Import or export categories doesn't work

[YoussefMo7amed]

• OS name and version: Android 13
• ActivityWatch version:  v0.12.1 (rust)

Describe the bug

Can't import and export categories (whebln clicked doesn't work), and when click export, the application crashes

To Reproduce

Steps to reproduce the behavior:
1. Go to settings
3. Scroll down to Categorization
4. Click on import or export

Expected behavior

Open the folder explorer to import or export a file.

Documentation

Additional context

Samsung One UI v5.1
With dark theme
And The application was in the dark theme

[github-actions]

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