Remove flutter chat (#26)

Had to squash merge manually as Forgejo was erroring

lib/widgets/lazy_loading/message_displayname.dart

@@ -0,0 +1,47 @@
+import "package:flutter/material.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:nexus/controllers/author_controller.dart";
+import "package:nexus/helpers/extensions/better_when.dart";
+import "package:nexus/helpers/extensions/get_localpart.dart";
+import "package:nexus/helpers/extensions/show_user_popover.dart";
+import "package:nexus/helpers/extensions/string_to_color.dart";
+import "package:nexus/models/event.dart";
+
+class MessageDisplayname extends ConsumerWidget {
+  final Event event;
+  final TextStyle? style;
+  final bool clickable;
+  const MessageDisplayname(
+    this.event, {
+    this.clickable = true,
+    this.style,
+    super.key,
+  });
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) => ref
+      .watch(AuthorController.provider(event))
+      .betterWhen(
+        data: (membership) => InkWell(
+          onTapUp: clickable
+              ? (details) => context.showUserPopover(
+                  membership,
+                  event.sender,
+                  globalPosition: details.globalPosition,
+                )
+              : null,
+          child: Text(
+            "${membership.displayName ?? event.sender.localpart}${event.pmp == null ? "" : " (via ${event.sender})"}",
+            style:
+                style ??
+                TextStyle(
+                  color: event.sender.colorHash,
+                  fontWeight: FontWeight.bold,
+                ),
+            maxLines: 1,
+            overflow: TextOverflow.ellipsis,
+          ),
+        ),
+        loading: () => Text(""),
+      );
+}