Clicking on menu options doesn't load any pages

- [ 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**: Windows 10.0.19044
- **ActivityWatch version**: 0.11.0

## Describe the bug
When I click any of the menu options of the dashboard nothing happens. Sometimes even the dashboard doesn't load at all.

## To Reproduce
1. Run ActivityTracker
2. Click on the icon tray the option Open Dashboard,
3. The browser loads (sometimes) on localhost:5600 and it loads the Home content (the one with the _Hello early user_ message
4. Clicking on any menu option doesn't do anything. No errors on the console either.

## Expected behavior
Something should load!

## Documentation

## Additional context

首先通过 ActivityTracker 重现该问题：使用托盘中的“Open Dashboard”选项，访问 localhost:5600，然后点击 dashboard 菜单中的每个选项。确定 dashboard 有时无法加载的原因，以及导航没有产生任何可见结果的原因；当 dashboard 能够可靠地打开，并且每个菜单选项都能在没有 console errors 的情况下加载其页面时，即表示完成。

由索引模型根据 Issue 内容生成。