Spellchecking on Linux?

[glocalglocal]

Describe the feature

It would be good to have spellchecking on Linux. At the moment, I use an external text editor to check spelling and copy the checked version into Interstellar which adds a lot of friction.

Interstellar Flatpak 10.0.1 on Debian 13.

Additional context

No response

[jwr1]

Here's the related Flutter issue: flutter/flutter#122433