Add app source and tests

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

lib/Peach/see/server/editor/ServerEditor.dart

@@ -0,0 +1,16 @@
+import 'package:flutter/cupertino.dart';
+
+import '../../../about/internal/application/ServerProfile.dart';
+import 'ServerEditorState.dart';
+
+/// Edits a server's connection details only. Services are managed on the
+/// server detail screen.
+class ServerEditor extends StatefulWidget {
+  /// null = register a new server.
+  final ServerProfile? server;
+
+  const ServerEditor({super.key, this.server});
+
+  @override
+  State<ServerEditor> createState() => ServerEditorState();
+}