Describe the feature:
The mobile crash overview page only shows "crash rate" but we would also like to add "affected users" which is a count of unique device.id in the crash set (crashes defined as logs marked with error.type: crash). The chart layout layout should mirror the layout on the error tab.

Here's a reference of the existing crash overview.

Here's a reference of the error overview, with the chart layout to apply to the crash over view page with the new "affected users" chart.