Highlight search results

[orhun]

Is your feature request related to a problem? Please describe.

While searching, it would be visually nice to see the found results being highlighted in the list.

For example:

Describe the solution you'd like

This needs some reading on displaying text docs but I'm thinking we can simply change the colors of Spans somehow.

Describe alternatives you've considered

None.

Additional context

See https://ratatui.rs/how-to/render/display-text and https://github.com/orhun/flawz/blob/32fb9ac656092404bad931c0e2e59438191ea0ab/src/main.rs#L73-L85