fix(screenshots): precache asset images so the home logo renders; explain the Plantare name

apps/app_seeds/test/screenshots/screenshots_test.dart

@@ -61,6 +61,15 @@ void main() {
     addTearDown(tester.view.resetPhysicalSize);
     addTearDown(tester.view.resetDevicePixelRatio);
     await tester.pumpAndSettle();
+    // Asset images (e.g. the home logo) decode via real async that the fake
+    // test clock doesn't drive, so they'd paint blank. Precache them for real,
+    // then repaint, so they show up in the golden.
+    await tester.runAsync(() async {
+      for (final element in find.byType(Image).evaluate()) {
+        await precacheImage((element.widget as Image).image, element);
+      }
+    });
+    await tester.pumpAndSettle();
     await expectLater(
       find.byType(MaterialApp),
       matchesGoldenFile('goldens/$dir/$name.png'),