chore: placeholder fade off / write to cache always

lib/imgproxy.dart

@@ -103,6 +103,8 @@ class ProxyImg extends StatelessWidget {
       width: width,
       height: height,
       fit: BoxFit.cover,
+      placeholderFadeInDuration: Duration.zero,
+      fadeOutDuration: Duration.zero,
       placeholder:
           (ctx, url) =>
               SvgPicture.asset("assets/svg/logo.svg", height: placeholderSize),

lib/rx_filter.dart

@@ -40,6 +40,7 @@ class _RxFilter<T> extends State<RxFilter<T>> {
     _response = ndk.requests.subscription(
       filters: widget.filters,
       explicitRelays: widget.relays,
+      cacheWrite: true
     );
     if (!widget.leaveOpen) {
       _response.future.then((_) {