Add app source and tests

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

lib/Peach/see/service/ViewServiceEditor.dart

@@ -0,0 +1,26 @@
+import 'package:file_picker/file_picker.dart';
+
+import '../parent/ParentViewModel.dart';
+import 'ConnectServiceEditor.dart';
+
+class ViewServiceEditor extends ParentViewModel {
+  ConnectServiceEditor connection;
+
+  ViewServiceEditor(super.context, this.connection);
+
+  /// True on desktop, where a local build can actually run.
+  bool get canBuildLocally => getDataManager().buildSupported;
+
+  /// Opens the OS folder picker for the service's source project.
+  void pickProjectDirectory() async {
+    try {
+      final directory = await FilePicker.getDirectoryPath(
+        dialogTitle: 'Select the service project folder',
+      );
+      if (directory == null) return;
+      connection.onProjectDirectoryPicked(directory);
+    } catch (error) {
+      handleError(error, pickProjectDirectory, () {}, "Retry");
+    }
+  }
+}