Remove flutter chat (#26)

Had to squash merge manually as Forgejo was erroring

lib/widgets/file_card.dart

@@ -0,0 +1,29 @@
+import "package:flutter/material.dart";
+import "package:nexus/helpers/extensions/size_to_string.dart";
+import "package:nexus/models/info/file.dart";
+
+class FileCard extends StatelessWidget {
+  final Uri uri;
+  final FileInfo? info;
+  final String? filename;
+  const FileCard(this.uri, this.info, {this.filename, super.key});
+
+  @override
+  Widget build(BuildContext context) => SizedBox(
+    width: 320,
+    child: Card(
+      color: Theme.of(context).colorScheme.surfaceContainer,
+      child: ListTile(
+        leading: Icon(Icons.file_copy),
+        title: Text(
+          filename ?? "file",
+          maxLines: 1,
+          overflow: TextOverflow.ellipsis,
+        ),
+        subtitle: info?.size == null ? null : Text(info!.size!.sizeAsString),
+        // TODO: Downloading files
+        trailing: IconButton(onPressed: null, icon: Icon(Icons.download)),
+      ),
+    ),
+  );
+}