Add wrap-around navigation option

[bitounu]

This PR adds a boolean option wrap to enable wrapping around the result list when navigating past the first or last entry.

Why:

Useful when creating custom scripts with a limited list of items; allows for fast navigation.

Testing:

1. Test wrap=false (default)
   printf 'a\nb\nc\nd\ne' | ./build/tofi --num-results 3
   Navigate to the end of the list using the down arrow —
   the cursor should stop.
   Navigate to the beginning using the up arrow —
   the cursor should also stop.

2. Test wrap=true
   printf 'a\nb\nc\nd\ne' | ./build/tofi --num-results 3 --wrap=true

• On the last item, pressing the down arrow → moves to the first item
• On the first item, pressing the up arrow → moves to the last item

3. Pagination test
   printf 'a\nb\nc\nd\ne\nf\ng\nh' | ./build/tofi --num-results 3 --wrap=true
   Navigate up/down through all pages and verify that wrapping only occurs after reaching the very end or beginning
   of the full list.

4. Config file test, create a file 'test.conf' with content:
   wrap = true
printf 'a\nb\nc' | ./build/tofi --config ./test.conf
   Test.
   Change content of file to:
   wrap = false
   Run again as above and test.