This improves the app updater so that it doesn't rely on unreliable
system notifications. Now, a banner in the tab bar will display when an
update is available. Clicking this will prompt the user to restart the
app and complete the installation.
This also updates the tab bar to move to the smaller tab size earlier so
we don't need to make the tab bar scrollable as much.

Adds support for window blur via the Vibrancy feature on macOS and the
BackgroundMaterial feature on Windows. The setting has no effect on
Linux. If both transparency and blur are set, transparency will take
precedence.
This adds a new global atom to track whether a window is in full screen.
It also updates the behavior of the tab bar so that it will only add an
extra left indent on macOS windows that are not in full screen.
Otherwise, the indent will be much smaller.
Adds support for building for Linux ARM targets using the new GitHub
Linux ARM64 runners. Adds a new menu item to toggle the visibility of
the menu bar on non-darwin targets,
Adds a new set of configurations for managing whether the app will
automatically check for updates. Ports over the auto update code from
the old app. In this version, the main difference is that updates can be
manually checked for using a menu bar item, even if auto updates are
disabled.