category builder not working

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

- **OS name and version**: 26.5.2 (25F84) MacOS Tahoe
- **ActivityWatch version**: v0.13.2
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## Describe the bug

2 parts to my issue which might be linked but I'm unsure.

(1) I'm getting the error: "Unable to find bucket matching 'aw-watcher-window_unknown' (hostname filter set to 'None')" randomly appear at the top of my activity feed whenever I click on filtering the reports etc.

(2) I'm getting 'High uncategorized time' as a warning telling me to go to the category builder. However when I visit the page I'm getting "Common words in "Uncategorized" events" come back as 'Loading' and it never loads.

I did see a similar issue a couple of years back when I checked, my hostname is 'unknown' but I couldn't seem to figure out if that was part of the problem.

## Expected behavior
The unknown category to load and for me to be able to classify it.

## Documentation

## Additional context