fix: minor design bugs

- fix spaces animation direction
- animate chat list app bar title
- fix ink splash radius in account selector
- fix missing asset fallback in content banner

Signed-off-by: TheOneWithTheBraid <the-one@with-the-braid.cf>

lib/widgets/content_banner.dart

@@ -66,6 +66,7 @@ class ContentBanner extends StatelessWidget {
                         imageUrl: src.toString(),
                         height: 300,
                         fit: BoxFit.cover,
+                        errorWidget: (c, m, e) => Icon(defaultIcon, size: 200),
                       );
                     })
                   : Icon(defaultIcon, size: 200),