✨ Able to render fediverse posts

lib/widgets/activitypub/actor_profile.dart

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+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:flutter/material.dart';
+import 'package:island/models/activitypub.dart';
+import 'package:material_symbols_icons/symbols.dart';
+
+class ActorAvatarWidget extends StatelessWidget {
+  final SnActivityPubActor actor;
+  final double radius;
+
+  const ActorAvatarWidget({super.key, required this.actor, this.radius = 16});
+
+  @override
+  Widget build(BuildContext context) {
+    final avatarUrl = actor.avatarUrl;
+    if (avatarUrl == null) {
+      return CircleAvatar(
+        radius: radius,
+        backgroundColor: Theme.of(context).colorScheme.surfaceContainer,
+        child: Icon(
+          Symbols.person,
+          color: Theme.of(context).colorScheme.onSurfaceVariant,
+        ),
+      );
+    }
+
+    return Stack(
+      children: [
+        CircleAvatar(
+          backgroundImage: CachedNetworkImageProvider(avatarUrl),
+          radius: radius,
+          backgroundColor: Theme.of(context).colorScheme.surfaceContainer,
+          child: Icon(
+            Symbols.person,
+            color: Theme.of(context).colorScheme.onSurfaceVariant,
+          ),
+        ),
+        Positioned(
+          right: 0,
+          bottom: 0,
+          child: CircleAvatar(
+            backgroundImage: actor.instance.iconUrl != null
+                ? CachedNetworkImageProvider(actor.instance.iconUrl!)
+                : null,
+            radius: radius * 0.4,
+            backgroundColor: Theme.of(context).colorScheme.primary,
+            child: actor.instance.iconUrl == null
+                ? Icon(
+                    Symbols.public,
+                    size: radius * 0.6,
+                    color: Theme.of(context).colorScheme.onPrimary,
+                  )
+                : null,
+          ),
+        ),
+      ],
+    );
+  }
+}