Some sample assets not showing in UWP

[Arlodotexe]

Background

          Hmm, this isn't showing up on the UWP sample... (Was also having trouble seeing the code samples in the sample app). Maybe something for us to investigate outside the PR? Or is this a faux-png image that's causing issues maybe? Worked in WASDK no problem though...

Originally posted by @michael-hawker in CommunityToolkit/Windows#109 (comment)

Problem

Some sample assets are not showing under the UWP in the HeaderedControl.Samples project.

WinAppSDK:

UWP:

WASM:

[michael-hawker]

Ugh, I needed to test something with an image... we're going to need to fix this in the next couple of weeks before release... CommunityToolkit/Windows#136

Don't think we should hold up the other PR, but would have liked to know if that's working and an issue with WASDK or not.

Worst case, hopefully we could fix forward, I'm not sure why it doesn't behave/attach properly on the first load.

[michael-hawker]

@Arlodotexe you said JPGs are working but not PNGs or something?

[michael-hawker]

I wonder if this is because we don't automatically set the Build Action to Content and the Copy to Output Directory as Copy if newer? We should probably have a hook here like we do to automatically include XAML pages to include images, right?

[michael-hawker]

Hmm, the Converters.Samples project does that in the sample project, but it doesn't work for the BoolToVisibilityConverter sample still...