Looks fine in light mode, text unreadable in dark mode.

Describe the bug
When exporting annotation with Flashcard, the JSON line is undefined

    },
    undefined,
    {

To Reproduce
Steps to reproduce the behavior:

1. Annotate a line of text
2. Add a Flashcard with data on back and front
3. Export annotation as JSON
4. Search "undefined" you should get to that badly exported entry

Expected behavior

Fla

To Reproduce
Click on "Download" or "Copy reference to note" in a context menu.

Expected behavior
The context menu will close.

Actual behavior
It stays open.

Notes

This issue is a summary of several To-dos found by developers.

• Replace path strings with std::filesystem::path / fs::path
  • AudioController: replace std::string with fs::path
  • Plugin: replace std::string with fs::path
  • ...
• Replace fs::path::string calls with fs::path::u8string, if the result is used to display paths.
• Cre