[ANAL-95](https://linear.app/tryghost/issue/ANAL-95/internal-beta-qa)
Various design refinements and fixes for the Stats page:
- Updated scroll area in detail modals so that the Close button and the footer is never outside the viewport
- The detail modal didn't close after clicking on the filter values
- "Show all" button was displayed also when there were no new items in the detail modal
- Dropdown styles needed a visual update: the toggles were way too huge and inconsistent with other dropdowns
- If no audience was selected we still showed stats. Now it's displaying the default empty screen in this case
- Click through filter indicators had low discoverability
- Technical data styles needed some love: changed the alignment and color scheme
- Mobile size viewports were not handled
- The google favicon API returned 404 many times for sources. Swapped the service for another one that returns favicons more reliably
- Default favicon was not handled. Now it comes from static.ghost.org
