Add app source and tests

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

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

@@ -0,0 +1,6 @@
+import '../../../about/internal/application/ServerProfile.dart';
+
+abstract class ConnectServerEditor {
+  /// The connection details were verified against the live server.
+  void onConnectionVerified(ServerProfile server);
+}