Improve the way long file/dir. names are handled by adding an overlay

## Problem

As mentioned in my other issue about column view, the current column view tries to solve trunkated text by having wide columns by default and allowing the user to resize them. This doesn't really work, as 99% of the time the text is too wide for any column to sanely show in full anyway, so there isn't a way for the user to contextually show a full itemname without the sizing of the UI to change drastically.

## Proposal

Popover boxes should appear when hovering over a filename that is too long so that no information is lost (macOS has done this for almost 2 decades)

## Prior Art