Links to files can be clicked from Navie

[dustinbyrne]

In the most recent version of @appland/components, a click-link event is emitted from the frontend when the user clicks a non-http(s) URL from within Navie. It provides a single argument, which is the href of the link clicked. This event should be handled to open the file in the main editor.

The href sent:

• May or may not contain a file: protocol
• May be a relative path, and for this reason, may be ambiguous
• May be an absolute path

E.g.:

/absolute/path/to/file.md
relative/path/to/file.md
file:///fully/qualified/absolute/path.md
file:.fully/qualified/relative/path.md

A best effort should be made to open the file given. In ambiguous cases, it's okay for now to select the best (or first) match.

Here's the implementation in Visual Studio Code: https://github.com/getappmap/vscode-appland/pull/1049/commits/33e9a63e6c511fad4a761a03400ab116530180b5