Add app source and tests

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

lib/Peach/about/internal/file/ConnectFileStorage.dart

@@ -0,0 +1,38 @@
+import 'dart:typed_data';
+
+import '../../../comms/Comms.dart' show LogLine;
+import '../application/ServiceConfig.dart';
+import '../application/StepTracker.dart';
+import 'BuildService.dart';
+
+/// Local-side file work: building the artifact to ship, reading it into
+/// memory, and packing a web build into a single archive. Kept behind an
+/// interface so a ViewModel reaches it through the same [DataManager] as
+/// everything else.
+abstract class ConnectFileStorage {
+  /// True on desktop, where local builds can run.
+  bool get buildSupported;
+
+  /// Build log lines and step progress, for the console and step list.
+  Stream<LogLine> get buildLogs;
+  Stream<List<DeployStep>> get buildStepStream;
+
+  /// Compiles [service]'s project and locates the produced jar.
+  Future<BuildResult> build(ServiceConfig service);
+
+  /// Compiles [service]'s web project and locates its static output directory.
+  Future<BuildResult> buildWeb(ServiceConfig service);
+
+  /// Cancels a build in flight.
+  void cancelBuild();
+
+  /// Reads a local artifact into memory, ready to upload.
+  Future<Uint8List> readArtifact(String path);
+
+  /// True when [path] exists on this machine.
+  Future<bool> artifactExists(String path);
+
+  /// Packs a directory of static files into gzipped tar bytes, returning the
+  /// archive and the number of files it contains. Runs off the UI isolate.
+  Future<(Uint8List, int)> packageWeb(String directoryPath);
+}