ChromeStatus stopped giving clear 404 error messages

[jrobbins]

If the user visits a URL for a feature that does not exist (e.g., because they only copied part of the ID of an existing feature) then our API gives 404 responses. However, our SPA UI spins a while and then shows a toast saying that "Something went wrong. Please try again."

We should present the user with a much more clear 404 response in the UI.

[Opalehmann]

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