This PR makes the `OpenProjectSettings` action open the settings UI in
project settings mode for the first visible worktree, instead of opening
the file. It also adds a `OpenProjectSettingsFile` action that maintains
the old behavior.
Finally, this PR partially fixes a bug where the settings UI won't load
project settings when the settings window is loaded before opening a
project/workspace. This happens because the global `app_state` isn't
correct in the `Subscription` that refreshes the available setting files
to open. The bug is still present in some cases, but it's out of scope
for this PR.
Release Notes:
- settings ui: Project Settings action now opens settings UI instead of
a file
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