Closes https://github.com/zed-industries/zed/discussions/25526
Follow up of #29872

Release Notes:

- Make `alt-left` and `alt-right` skip punctuation on Mac OS to respect
the Mac default behaviour. When pressing alt-left and the first
character is a punctuation character like a dot, this character should
be skipped. For example: `hello.|` goes to `|hello.`

This change makes the editor feels much snappier, it now follows the
same behaviour as VSCode and any other Mac OS native application.


@ConradIrwin