Remove flutter chat (#26)

Had to squash merge manually as Forgejo was erroring

lib/widgets/event_preview.dart

@@ -0,0 +1,36 @@
+import "package:flutter/material.dart";
+import "package:nexus/models/content/message.dart";
+import "package:nexus/models/event.dart";
+import "package:nexus/widgets/lazy_loading/message_avatar.dart";
+import "package:nexus/widgets/lazy_loading/message_displayname.dart";
+import "package:nexus/widgets/renderers/event.dart";
+
+class EventPreview extends StatelessWidget {
+  final Event event;
+  const EventPreview(this.event, {super.key});
+
+  @override
+  Widget build(BuildContext context) => IgnorePointer(
+    child: Padding(
+      padding: EdgeInsets.symmetric(vertical: 4),
+      child: Row(
+        spacing: 12,
+        children: [
+          if (event.content is MessageContent) MessageAvatar(event),
+
+          Expanded(
+            child: Wrap(
+              crossAxisAlignment: WrapCrossAlignment.center,
+              spacing: 8,
+              runSpacing: 2,
+              children: [
+                if (event.content is MessageContent) MessageDisplayname(event),
+                EventRenderer(event, textOnly: true, maxLines: 1),
+              ],
+            ),
+          ),
+        ],
+      ),
+    ),
+  );
+}