Folder created in home directory (clashes with documented location)

- [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.

AW Version: v0.13.1 (rust) (according to settings in dashboard page)
```
brew info activitywatch@beta
==> activitywatch@beta ✔ (ActivityWatch): 0.14.0b4
Time tracker
https://activitywatch.net/
Installed (on request)
```
- **OS name and version**:
OS version: macOS 26.6.2
Architecture: arm64
- **ActivityWatch version**:
Version: v0.13.1 (rust)

## Describe the bug

I have just installed ActivityWatch via homebrew
`brew install activitywatch@beta`
and it appears to have created a folder in my home directory.
`~/ActivityWatchSync`

It contains a folder
`d825xxxx-xxxx-xxxx-xxxx-xxxxxxxxxx`
which contains
`test.db`

## To Reproduce

install via homebrew, have folder appear in Mac home directory.

## Expected behavior
It should use the directories listed at
https://docs.activitywatch.net/en/latest/directories.html