The 'tapping search icon shows search bar' test was stale: the SearchBar is
now permanently visible in AppBar.bottom, so both its assertions held before
any tap. Deleted it; the existing 'SearchBar is always visible in the AppBar'
test already covers the same intent.
Added NoSplash.splashFactory to the widget-test ThemeData to prevent Flutter
from loading the pre-compiled ink_sparkle.frag shader, which was built for an
older SDK version and caused an INVALID_ARGUMENT crash on Flutter 3.44.0.
Closes#486
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>