dark color theme has missing colors

[D4ntin]

• I am on the latest ActivityWatch version.
  Actually I'm on the latest prerelease v0.12.3b15
• I have searched the issues of this repo and believe that this is not a duplicate.

• OS name and version: Arch 6.6.3-arch1-1 x86_64 GNU/Linux
• ActivityWatch version: Prerelease v0.12.3b15

Describe the bug

The dark mode theme is using default 'light' mode colors in some spots throughout the application.

To Reproduce: Timeline

1. Go to Settings -> Theme
2. Enable dark mode
3. Go to http://localhost:5600/#/timeline Timeline
4. Click on Filter
5. The Filter button background has a light background (should be dark)

Screenshots

To Reproduce: Stopwatch

1. Go to Settings -> Theme
2. Enable dark mode
3. Go to http://localhost:5600/#/stopwatch Stopwatch
4. Enter a project name and start the stopwatch
5. Hover over the entries in the Running and History lists.
6. The :hover color of the entry has a light background (should be dark)

Screenshots

Expected behavior

The above mentioned elements should have a dark background color when using dark mode.