Add app source and tests

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

lib/Peach/see/files/Files.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/cupertino.dart';
+
+import '../../about/internal/application/ServerProfile.dart';
+import 'FilesState.dart';
+
+/// Browse the server over SFTP: navigate directories, upload local files into
+/// the current directory, and download remote files to local disk.
+class Files extends StatefulWidget {
+  final ServerProfile server;
+
+  const Files({super.key, required this.server});
+
+  @override
+  State<Files> createState() => FilesState();
+}