Add ability to send images over lora

lib/services/image_codec_session_stub.dart

@@ -0,0 +1,53 @@
+import 'dart:typed_data';
+
+import '../models/image_codec_support.dart';
+
+/// Web stand-in. There is no isolate and no native runtime on web, so the
+/// session cannot exist; `ImageCodecService` gates on `kIsWeb` long before it
+/// would reach here.
+class ImageCodecSession {
+  ImageCodecSession._();
+
+  static Future<ImageCodecSession> spawn(ImageCodecBundle bundle) async {
+    throw UnsupportedError('The image codec is not supported on web.');
+  }
+
+  String get backendName => 'unsupported';
+
+  bool get supportsBitstreamCodec => false;
+
+  bool get hasEntropyGraph => false;
+
+  bool get hasTables => false;
+
+  Future<void> release({bool decoder = false, bool entropy = false}) async {}
+
+  Future<Uint8List> decodeLatent(
+    Float32List yHat, {
+    void Function(double progress)? onProgress,
+  }) async {
+    throw UnsupportedError('The image codec is not supported on web.');
+  }
+
+  Future<Uint8List> encode(
+    Uint8List rgbBytes,
+    AeicRatePoint ratePoint,
+    int resolution, {
+    void Function(double progress)? onProgress,
+  }) async {
+    throw UnsupportedError('The image codec is not supported on web.');
+  }
+
+  Future<Uint8List> decode(
+    Uint8List bitstream,
+    AeicRatePoint ratePoint,
+    int resolution, {
+    void Function(double progress)? onProgress,
+  }) async {
+    throw UnsupportedError('The image codec is not supported on web.');
+  }
+
+  void cancel() {}
+
+  Future<void> dispose() async {}
+}