Fixes a few problems,

- Uses `Boundary::Grid` instead of `Boundary::Cursor` for highlighted
range adjustments.

This fixes quite a few wierd behaviors around highlighting paths that
had to be scrolled into view (i.e. were in the terminal history)
including the issue described in the release notes as well as a
regression caused by #26401 where the highlight range would span from
the start of the path to the cursor location in the shell prompt

- Strips all trailing `:`s from the paths, updating the highlighted
range accordingly.

This worked fine before and is just a visual improvement.


Release Notes:

- Fixed an issue where file paths in the terminal surrounded by `()` or
`[]` would not be highlighted properly