Activity Watch Android crashing after trying to import categories

- [x] I am on the [latest](https://github.com/ActivityWatch/activitywatch/releases/latest) ActivityWatch version.
- [x] I have searched the issues of this repo and believe that this is not a duplicate.

- **OS name and version**:Android 14, One UI 6.1
- **ActivityWatch version**: v0.12.1

## Describe the bug
Attempting to import or export categories into settings is unresponsive on the first attempt; after multiple attempts spamming the import button the app closes

## To Reproduce

1. Go to Settings
2. Scroll down until you find restore defaults, import and export under categorization.
3. Click on import and it changes colour to know the button has been activated but nothing happens, where youd expect an explorer or files to pop up so you can import your settings file but nothing.
4. If you spam the import and export buttons sometimes the app closes on itself
## Expected behavior

A file management app to open asking me to locate the category settings file

## Documentation

## Additional context
I wanted to send a screen record but it was too big to send.