Add app source and tests

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

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

@@ -0,0 +1,32 @@
+import '../../../about/internal/application/NotificationType.dart';
+import '../../../about/internal/application/ServerProfile.dart';
+import '../../parent/ParentViewModel.dart';
+import 'ConnectServerEditor.dart';
+
+class ViewServerEditor extends ParentViewModel {
+  ConnectServerEditor connection;
+
+  ViewServerEditor(super.context, this.connection);
+
+  /// Opens an SSH session with the details as entered, so the user finds out
+  /// now — not at first deploy — whether they work.
+  void testConnection(ServerProfile server) async {
+    showLoading("Connecting to ${server.host} …");
+    try {
+      await getDataManager().connect(server);
+      closeLoading();
+      connection.onConnectionVerified(server);
+      showApplicationNotification(
+        NotificationType.success,
+        "Connection verified",
+        "Peach signed in to ${server.username}@${server.host}:${server.port} "
+            "successfully.",
+        true,
+        true,
+        null,
+      );
+    } catch (error) {
+      handleError(error, () => testConnection(server), () {}, "Retry");
+    }
+  }
+}