Android App to import and export categorizetion rule

[shengjie-chen]

• [x] I am on the 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-xiaomi hyperos1.0.4/Android 13-zui15
• ActivityWatch version: v0.12.1(both, in google play)

Describe the bug

There are issues attempting to import and export categorization rules in the categorization options of the settings interface. Clicking on import did not respond. clicking on export: or flashback directly.

Expected behavior

After clicking import, the corresponding JSON file can be found from the default file manager, and exporting can generate the corresponding JSON file

[github-actions[bot]]

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