* download CAR file using AtpAgent instead of building URL
* add loader icon on download car button
* actually save to disk on android
* style nits
* bottom margin nit
* localize toast
* remove fallback so back button works correctly
* keep throwing an error if mime type isn't used
* be more explicit with toasts
* send errors to sentry when encountered
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Co-authored-by: Hailey <me@haileyok.com>
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