appview/strings: allow extensionless filenames #516

My editor auto-deleted a trailing space from a line in appview/db/strings.go. Do I need to replace it?

I wrote up a whole description which got swallowed up by https://tangled.sh/@tangled.sh/core/issues/188. Here's a slightly shortened version:

This fixes https://tangled.sh/@tangled.sh/core/issues/187

I don't have nix set up (and I'm on a niche distribution where that might not be the most straightforward thing to change), so I did not test this or run the formatter.

However, I did my best to find and understand all related code. The only code I found that did anything special with the filename was markup.getFormat(), which I confirmed should handle extensionless filenames correctly.

can confirm this works, and formatting looks to be fine

@poor.dog Thanks for checking!

lgtm thanks!