Weird navigation in search bar for `f + i` keys

[TarVK]

Our used font merges the f character with subsequent i and or l characters. This seems to cause some issues in our current caret rendering, which should be looked into.

[TarVK]

I don't know about what exactly causes this, but I do know it's likely related to how I measure text length to determine cursor position: SyntaxHighlighterSelection.tsx#L17

We should either do some good debugging here to really fix the issue if we can, or otherwise at least replace the default with a font that doesn't have this merging feature. Currently the fonts are specified here: createTheme.tsx#L78, Lato-Light.ttf

Obviously properly fixing the issue is better, but this is quite an edge case, so simply replacing the default font also is acceptable for now in my opinion.